diff --git a/Lidgren.Network/Lidgren.Network.csproj b/Lidgren.Network/Lidgren.Network.csproj
index b5ea57927..80fec2436 100644
--- a/Lidgren.Network/Lidgren.Network.csproj
+++ b/Lidgren.Network/Lidgren.Network.csproj
@@ -45,7 +45,7 @@
     <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release\</OutputPath>
-    <DefineConstants>TRACE</DefineConstants>
+    <DefineConstants>TRACE;USE_RELEASE_STATISTICS</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
diff --git a/Subsurface/Barotrauma.csproj b/Subsurface/Barotrauma.csproj
index 2f4419f25..b825317a0 100644
--- a/Subsurface/Barotrauma.csproj
+++ b/Subsurface/Barotrauma.csproj
@@ -100,6 +100,7 @@
     <Compile Include="Source\Map\SubmarineHull.cs" />
     <Compile Include="Source\Networking\NetConfig.cs" />
     <Compile Include="Source\Networking\NetStats.cs" />
+    <Compile Include="Source\Networking\ReliableSender.cs" />
     <Compile Include="Source\Particles\ParticleEmitter.cs" />
     <Compile Include="Source\Screens\ServerListScreen.cs" />
     <Compile Include="Source\Utils\Rand.cs" />
diff --git a/Subsurface/Properties/AssemblyInfo.cs b/Subsurface/Properties/AssemblyInfo.cs
index 32dd7fc3b..43a9e6164 100644
--- a/Subsurface/Properties/AssemblyInfo.cs
+++ b/Subsurface/Properties/AssemblyInfo.cs
@@ -31,5 +31,5 @@ using System.Runtime.InteropServices;
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("0.2.0.0")]
-[assembly: AssemblyFileVersion("0.2.0.0")]
+[assembly: AssemblyVersion("0.2.2.0")]
+[assembly: AssemblyFileVersion("0.2.2.0")]
diff --git a/Subsurface/Source/Characters/AICharacter.cs b/Subsurface/Source/Characters/AICharacter.cs
index 0642b529d..69dd89a79 100644
--- a/Subsurface/Source/Characters/AICharacter.cs
+++ b/Subsurface/Source/Characters/AICharacter.cs
@@ -83,11 +83,11 @@ namespace Barotrauma
             return result;
         }
 
-        public override void FillNetworkData(NetworkEventType type, NetOutgoingMessage message, object data)
+        public override bool FillNetworkData(NetworkEventType type, NetOutgoingMessage message, object data)
         {
             if (type == NetworkEventType.KillCharacter)
             {
-                return;
+                return true;
             }
 
             message.Write((float)NetTime.Now);
@@ -127,6 +127,9 @@ namespace Barotrauma
 
                 LargeUpdateTimer = Math.Max(0, LargeUpdateTimer - 1);
             }
+
+
+            return true;
         }
         
         public override void ReadNetworkData(NetworkEventType type, NetIncomingMessage message)
diff --git a/Subsurface/Source/Characters/Character.cs b/Subsurface/Source/Characters/Character.cs
index 2a557fe23..a36ce84b1 100644
--- a/Subsurface/Source/Characters/Character.cs
+++ b/Subsurface/Source/Characters/Character.cs
@@ -1084,21 +1084,21 @@ namespace Barotrauma
             }
         }
 
-        public override void FillNetworkData(NetworkEventType type, NetOutgoingMessage message, object data)
+        public override bool FillNetworkData(NetworkEventType type, NetOutgoingMessage message, object data)
         {
             if (type == NetworkEventType.PickItem)
             {
                 message.Write((int)data);
-                return;
+                return true;
             }
             else if (type== NetworkEventType.SelectCharacter)
             {
                 message.Write((int)data);
-                return;
+                return true;
             }
             else if (type == NetworkEventType.KillCharacter)
             {
-                return;            
+                return true;            
             }
 
             var hasInputs =  
@@ -1160,7 +1160,9 @@ namespace Barotrauma
                 message.Write(AnimController.RefLimb.SimPosition.Y);
 
                 LargeUpdateTimer = Math.Max(0, LargeUpdateTimer-1);
-            }            
+            }
+
+            return true;
         }
 
         public override void ReadNetworkData(NetworkEventType type, NetIncomingMessage message)
diff --git a/Subsurface/Source/DebugConsole.cs b/Subsurface/Source/DebugConsole.cs
index 4ed836b2b..d132e6a6c 100644
--- a/Subsurface/Source/DebugConsole.cs
+++ b/Subsurface/Source/DebugConsole.cs
@@ -325,6 +325,11 @@ namespace Barotrauma
                     //Ragdoll.DebugDraw = !Ragdoll.DebugDraw;
                     GameMain.DebugDraw = !GameMain.DebugDraw;
                     break;
+                case "netstats":
+                    if (GameMain.Server == null) return;
+
+                    GameMain.Server.ShowNetStats = !GameMain.Server.ShowNetStats;
+                    break;
                 default:
                     NewMessage("Command not found", Color.Red);
                     break;
diff --git a/Subsurface/Source/GameSession/GameModes/TutorialMode.cs b/Subsurface/Source/GameSession/GameModes/TutorialMode.cs
index 5cadb67c0..6b49c7be9 100644
--- a/Subsurface/Source/GameSession/GameModes/TutorialMode.cs
+++ b/Subsurface/Source/GameSession/GameModes/TutorialMode.cs
@@ -613,6 +613,8 @@ namespace Barotrauma
         {
             do
             {
+                if (enemy == null) break;
+
                 enemy.Health = 50.0f;
 
                 enemy.AIController.State = AIController.AiState.None;
diff --git a/Subsurface/Source/Items/Inventory.cs b/Subsurface/Source/Items/Inventory.cs
index 8cbff3e8f..70df9f8f4 100644
--- a/Subsurface/Source/Items/Inventory.cs
+++ b/Subsurface/Source/Items/Inventory.cs
@@ -279,12 +279,14 @@ namespace Barotrauma
                 spriteBatch.DrawString(GUI.Font, (int)item.Condition + " %", new Vector2(rect.X + rect.Width / 2, rect.Y + rect.Height / 2), Color.Red);
         }
 
-        public override void FillNetworkData(NetworkEventType type, NetOutgoingMessage message, object data)
+        public override bool FillNetworkData(NetworkEventType type, NetOutgoingMessage message, object data)
         {
             for (int i = 0; i<capacity; i++)
             {
                 message.Write((items[i] == null) ? -1 : items[i].ID);
             }
+
+            return true;
         }
 
         public override void ReadNetworkData(NetworkEventType type, NetIncomingMessage message)
diff --git a/Subsurface/Source/Items/Item.cs b/Subsurface/Source/Items/Item.cs
index 10d2df900..ff5b7b7ec 100644
--- a/Subsurface/Source/Items/Item.cs
+++ b/Subsurface/Source/Items/Item.cs
@@ -1156,7 +1156,7 @@ namespace Barotrauma
             new NetworkEvent(NetworkEventType.UpdateComponent, ID, isClient, index);
         }
 
-        public override void FillNetworkData(NetworkEventType type, NetOutgoingMessage message, object data)
+        public override bool FillNetworkData(NetworkEventType type, NetOutgoingMessage message, object data)
         {
             message.Write(condition);
 
@@ -1172,7 +1172,7 @@ namespace Barotrauma
                 case NetworkEventType.UpdateComponent:
 
                     int componentIndex = (int)data;
-                    if (componentIndex < 0 || componentIndex >= components.Count) return;
+                    if (componentIndex < 0 || componentIndex >= components.Count) return false;
                     
                     message.Write((byte)componentIndex);
                     components[componentIndex].FillNetworkData(type, message);
@@ -1214,6 +1214,8 @@ namespace Barotrauma
                     
                     break;
             }
+
+            return true;
         }
 
         public override void ReadNetworkData(NetworkEventType type, NetIncomingMessage message)
diff --git a/Subsurface/Source/Map/Entity.cs b/Subsurface/Source/Map/Entity.cs
index 48d868ce2..835ccdcec 100644
--- a/Subsurface/Source/Map/Entity.cs
+++ b/Subsurface/Source/Map/Entity.cs
@@ -64,7 +64,10 @@ namespace Barotrauma
             dictionary.Add(id, this);
         }
 
-        public virtual void FillNetworkData(NetworkEventType type, NetOutgoingMessage message, object data) { }
+        public virtual bool FillNetworkData(NetworkEventType type, NetOutgoingMessage message, object data) 
+        {
+            return false;
+        }
         public virtual void ReadNetworkData(NetworkEventType type, NetIncomingMessage message) { }
 
         /// <summary>
diff --git a/Subsurface/Source/Map/Hull.cs b/Subsurface/Source/Map/Hull.cs
index 36142d8a3..b75ef5671 100644
--- a/Subsurface/Source/Map/Hull.cs
+++ b/Subsurface/Source/Map/Hull.cs
@@ -471,9 +471,11 @@ namespace Barotrauma
             h.ID = int.Parse(element.Attribute("ID").Value);
         }
 
-        public override void FillNetworkData(Networking.NetworkEventType type, Lidgren.Network.NetOutgoingMessage message, object data)
+        public override bool FillNetworkData(Networking.NetworkEventType type, Lidgren.Network.NetOutgoingMessage message, object data)
         {
             message.Write(volume);
+
+            return true;
         }
 
         public override void ReadNetworkData(Networking.NetworkEventType type, Lidgren.Network.NetIncomingMessage message)
diff --git a/Subsurface/Source/Map/Structure.cs b/Subsurface/Source/Map/Structure.cs
index a5d541f40..d8858e61b 100644
--- a/Subsurface/Source/Map/Structure.cs
+++ b/Subsurface/Source/Map/Structure.cs
@@ -636,7 +636,7 @@ namespace Barotrauma
 
         }
 
-        public override void FillNetworkData(NetworkEventType type, NetOutgoingMessage message, object data)
+        public override bool FillNetworkData(NetworkEventType type, NetOutgoingMessage message, object data)
         {
             int sectionIndex = 0;
             byte byteIndex = 0;
@@ -648,12 +648,14 @@ namespace Barotrauma
             }
             catch
             {
-                return;
+                return false;
             }
 
             message.Write((float)NetTime.Now);
             message.Write(byteIndex);
             message.Write(sections[sectionIndex].damage);
+
+            return true;
         }
 
         public override void ReadNetworkData(NetworkEventType type, NetIncomingMessage message)
diff --git a/Subsurface/Source/Map/Submarine.cs b/Subsurface/Source/Map/Submarine.cs
index 21ed6e856..b52386284 100644
--- a/Subsurface/Source/Map/Submarine.cs
+++ b/Subsurface/Source/Map/Submarine.cs
@@ -149,7 +149,7 @@ namespace Barotrauma
             }
 
             base.Remove();
-            ID = -1;
+            ID = -5;
         }
 
         //drawing ----------------------------------------------------
@@ -378,14 +378,18 @@ namespace Barotrauma
             Level.Loaded.Move(-amount);
         }
 
-        public override void FillNetworkData(Networking.NetworkEventType type, NetOutgoingMessage message, object data)
+        public override bool FillNetworkData(Networking.NetworkEventType type, NetOutgoingMessage message, object data)
         {
+            if (subBody == null) return false;
+
             message.Write((float)NetTime.Now);
             message.Write(Position.X);
             message.Write(Position.Y);
 
             message.Write(Speed.X);
             message.Write(Speed.Y);
+
+            return true;
         }
 
         public override void ReadNetworkData(Networking.NetworkEventType type, NetIncomingMessage message)
diff --git a/Subsurface/Source/Networking/GameClient.cs b/Subsurface/Source/Networking/GameClient.cs
index 625a41121..26ef45aa0 100644
--- a/Subsurface/Source/Networking/GameClient.cs
+++ b/Subsurface/Source/Networking/GameClient.cs
@@ -3,6 +3,7 @@ using System.Diagnostics;
 using Lidgren.Network;
 using Microsoft.Xna.Framework;
 using System.Collections.Generic;
+using Barotrauma.Networking.ReliableMessages;
 
 namespace Barotrauma.Networking
 {
@@ -12,6 +13,8 @@ namespace Barotrauma.Networking
 
         private GUIMessageBox reconnectBox;
 
+        private ReliableChannel reliableChannel;
+
         private bool connected;
 
         private int myID;
@@ -34,6 +37,7 @@ namespace Barotrauma.Networking
 
             otherClients = new List<Client>();
 
+
         }
 
         public void ConnectToServer(string hostIP, string password = "")
@@ -63,6 +67,7 @@ namespace Barotrauma.Networking
 #if DEBUG
             config.SimulatedLoss = 0.1f;
             config.SimulatedMinimumLatency = 0.3f;
+            config.SimulatedRandomLatency = 0.5f;
 #endif 
 
             config.DisableMessageType(NetIncomingMessageType.DebugMessage | NetIncomingMessageType.WarningMessage | NetIncomingMessageType.Receipt
@@ -70,6 +75,7 @@ namespace Barotrauma.Networking
 
             // Create new client, with previously created configs
             client = new NetClient(config);
+            reliableChannel = new ReliableChannel(client);
                       
             NetOutgoingMessage outmsg = client.CreateMessage();                        
             client.Start();
@@ -329,6 +335,8 @@ namespace Barotrauma.Networking
                     new NetworkEvent(myCharacter.ID, true);                    
                 }
             }
+
+            reliableChannel.Update(deltaTime);
                           
             foreach (NetworkEvent networkEvent in NetworkEvent.events)
             {
@@ -368,8 +376,17 @@ namespace Barotrauma.Networking
             while ((inc = client.ReadMessage()) != null)
             {
                 if (inc.MessageType != NetIncomingMessageType.Data) continue;
-                
-                switch (inc.ReadByte())
+
+                //todo: exception handling
+                byte packetType = inc.ReadByte();
+
+                if (packetType == (byte)PacketTypes.ReliableMessage)
+                {
+                    if (!reliableChannel.CheckMessage(inc)) continue;
+                    packetType = inc.ReadByte();
+                }
+
+                switch (packetType)
                 {
                     case (byte)PacketTypes.StartGame:
                         if (gameStarted) continue;
@@ -427,6 +444,12 @@ namespace Barotrauma.Networking
 
                         new GUIMessageBox("You are the Traitor!", "Your secret task is to assassinate " + targetName + "!");
 
+                        break;
+                    case (byte)PacketTypes.ResendRequest:
+                        reliableChannel.HandleResendRequest(inc);
+                        break;
+                    case (byte)PacketTypes.Ack:
+                        reliableChannel.HandleAckMessage(inc);
                         break;
                 }                
             }
@@ -652,13 +675,13 @@ namespace Barotrauma.Networking
             //AddChatMessage(message);
 
             type = (gameStarted && myCharacter != null && myCharacter.IsDead) ? ChatMessageType.Dead : ChatMessageType.Default;
+            
+            ReliableMessage msg = reliableChannel.CreateMessage();
+            msg.InnerMessage.Write((byte)PacketTypes.Chatmessage);
+            msg.InnerMessage.Write((byte)type);
+            msg.InnerMessage.Write(message);
 
-            NetOutgoingMessage msg = client.CreateMessage();
-            msg.Write((byte)PacketTypes.Chatmessage);
-            msg.Write((byte)type);
-            msg.Write(message);
-
-            client.SendMessage(msg, NetDeliveryMethod.ReliableUnordered);
+            reliableChannel.SendMessage(msg, client.ServerConnection);
         }
 
         /// <summary>
diff --git a/Subsurface/Source/Networking/GameServer.cs b/Subsurface/Source/Networking/GameServer.cs
index 2a9df35c1..19fb18d3d 100644
--- a/Subsurface/Source/Networking/GameServer.cs
+++ b/Subsurface/Source/Networking/GameServer.cs
@@ -5,11 +5,13 @@ using System.Diagnostics;
 using Lidgren.Network;
 using Microsoft.Xna.Framework;
 using RestSharp;
+using Barotrauma.Networking.ReliableMessages;
 
 namespace Barotrauma.Networking
 {
     class GameServer : NetworkMember
     {
+        public bool ShowNetStats;
 
         public List<Client> connectedClients = new List<Client>();
 
@@ -64,7 +66,7 @@ namespace Barotrauma.Networking
 
 #if DEBUG
             config.SimulatedLoss = 0.2f;
-            config.SimulatedMinimumLatency = 0.3f;
+            config.SimulatedRandomLatency = 0.6f;
             config.SimulatedDuplicatesChance = 0.05f;
             config.SimulatedMinimumLatency = 0.1f;
 #endif 
@@ -96,9 +98,9 @@ namespace Barotrauma.Networking
             }
             catch (Exception e)
             {
-                DebugConsole.ThrowError("Couldn't start the server", e);                
+                DebugConsole.ThrowError("Couldn't start the server", e);
             }
-                            
+         
 
             if (config.EnableUPnP)
             {
@@ -225,7 +227,7 @@ namespace Barotrauma.Networking
         
         public override void Update(float deltaTime)
         {
-            if (GameMain.DebugDraw) netStats.Update(deltaTime);
+            if (ShowNetStats) netStats.Update(deltaTime);
 
             if (!started) return;
 
@@ -268,8 +270,13 @@ namespace Barotrauma.Networking
                 disconnectedClients.RemoveAt(i);
             }
 
-            NetIncomingMessage inc = server.ReadMessage();
-            if (inc != null)
+            foreach (Client c in connectedClients)
+            {
+                c.ReliableChannel.Update(deltaTime);
+            }
+
+            NetIncomingMessage inc = null; 
+            while ((inc = server.ReadMessage()) != null)
             {
                 try
                 {
@@ -277,7 +284,11 @@ namespace Barotrauma.Networking
                 }
                 catch
                 {
+#if DEBUG
+                    DebugConsole.ThrowError("Failed to read incoming message");
+#endif
 
+                    continue;
                 }
             }
 
@@ -416,7 +427,26 @@ namespace Barotrauma.Networking
                     break;
                 case NetIncomingMessageType.Data:
 
-                    switch (inc.ReadByte())
+                    Client dataSender = connectedClients.Find(c => c.Connection == inc.SenderConnection);
+                    if (dataSender == null) return;
+
+                    byte packetType = 0;
+                    try
+                    {
+                        packetType = inc.ReadByte();
+                    }
+                    catch
+                    {
+                        return;
+                    }
+
+                    if (packetType == (byte)PacketTypes.ReliableMessage)
+                    {
+                        if (!dataSender.ReliableChannel.CheckMessage(inc)) return;
+                        packetType = inc.ReadByte();
+                    }
+
+                    switch (packetType)
                     {
                         case (byte)PacketTypes.NetworkEvent:
                             if (!gameStarted) break;
@@ -452,6 +482,13 @@ namespace Barotrauma.Networking
                         case (byte)PacketTypes.CharacterInfo:
                             ReadCharacterData(inc);
                             break;
+                        case (byte)PacketTypes.ResendRequest:
+                            
+                            dataSender.ReliableChannel.HandleResendRequest(inc);
+                            break;
+                        case (byte)PacketTypes.Ack:
+                            dataSender.ReliableChannel.HandleAckMessage(inc);
+                            break;
                     }
                     break;
                 case NetIncomingMessageType.WarningMessage:
@@ -552,7 +589,7 @@ namespace Barotrauma.Networking
                 userID++;
             }
 
-            Client newClient = new Client(name, userID);
+            Client newClient = new Client(server, name, userID);
             newClient.Connection = inc.SenderConnection;
             newClient.version = version;
 
@@ -581,26 +618,23 @@ namespace Barotrauma.Networking
         {
             if (NetworkEvent.events.Count == 0) return;
 
+            List<NetConnection> recipients = new List<NetConnection>();
+            foreach (Client c in connectedClients)
+            {
+                if (c.character == null) continue;
+                //if (networkEvent.Type == NetworkEventType.UpdateEntity && 
+                //    Vector2.Distance(e.SimPosition, c.character.SimPosition) > NetConfig.UpdateEntityDistance) continue;
+
+                recipients.Add(c.Connection);
+            }                
+
+            if (recipients.Count == 0) return;
+
             foreach (NetworkEvent networkEvent in NetworkEvent.events)  
             {
-
-                List<NetConnection> recipients = new List<NetConnection>();
-
                 Entity e = Entity.FindEntityByID(networkEvent.ID);
                 if (e == null) continue;
 
-                foreach (Client c in connectedClients)
-                {
-                    if (c.character == null) continue;
-                    //if (networkEvent.Type == NetworkEventType.UpdateEntity && 
-                    //    Vector2.Distance(e.SimPosition, c.character.SimPosition) > NetConfig.UpdateEntityDistance) continue;
-
-                    recipients.Add(c.Connection);
-                }
-                
-
-                if (recipients.Count == 0) return;
-
                 NetOutgoingMessage message = server.CreateMessage();
                 message.Write((byte)PacketTypes.NetworkEvent);
                 //if (!networkEvent.IsClient) continue;
@@ -872,7 +906,7 @@ namespace Barotrauma.Networking
         {
             base.Draw(spriteBatch);
 
-            if (!GameMain.DebugDraw) return;
+            if (!ShowNetStats) return;
 
             int width = 200, height = 300;
             int x = GameMain.GraphicsWidth - width, y = (int)(GameMain.GraphicsHeight*0.3f);
@@ -934,27 +968,22 @@ namespace Barotrauma.Networking
 
             if (server.Connections.Count == 0) return;
 
-            NetOutgoingMessage msg = server.CreateMessage();
-            msg.Write((byte)PacketTypes.Chatmessage);
-            msg.Write((byte)type);
-            msg.Write(message);
+            List<Client> recipients = new List<Client>();
 
-            if (type==ChatMessageType.Dead)
+            foreach (Client c in connectedClients)
             {
-                List<NetConnection> recipients = new List<NetConnection>();
-                foreach (Client c in connectedClients)
-                {
-                    if (c.character != null && c.character.IsDead) recipients.Add(c.Connection);                    
-                }
-                if (recipients.Count>0)
-                {
-                    server.SendMessage(msg, recipients, NetDeliveryMethod.ReliableUnordered, 0);
-                }                
+                if (type!=ChatMessageType.Dead || (c.character != null && c.character.IsDead)) recipients.Add(c);
             }
-            else
+
+            foreach (Client c in recipients)
             {
-                server.SendMessage(msg, server.Connections, NetDeliveryMethod.ReliableUnordered, 0);
-            }
+                ReliableMessage msg = c.ReliableChannel.CreateMessage();
+                msg.InnerMessage.Write((byte)PacketTypes.Chatmessage);
+                msg.InnerMessage.Write((byte)type);
+                msg.InnerMessage.Write(message);            
+
+                c.ReliableChannel.SendMessage(msg, c.Connection);
+            }      
             
         }
 
@@ -1177,13 +1206,21 @@ namespace Barotrauma.Networking
         public List<JobPrefab> jobPreferences;
         public JobPrefab assignedJob;
 
+        public ReliableChannel ReliableChannel;
+
         public float deleteDisconnectedTimer;
 
+        public Client(NetPeer server, string name, int ID)
+            : this(name, ID)
+        {
+            ReliableChannel = new ReliableChannel(server);
+        }
+
         public Client(string name, int ID)
         {
             this.name = name;
             this.ID = ID;
-
+            
             jobPreferences = new List<JobPrefab>(JobPrefab.List.GetRange(0,3));
         }
     }
diff --git a/Subsurface/Source/Networking/NetStats.cs b/Subsurface/Source/Networking/NetStats.cs
index 038bde271..709796eb6 100644
--- a/Subsurface/Source/Networking/NetStats.cs
+++ b/Subsurface/Source/Networking/NetStats.cs
@@ -79,13 +79,13 @@ namespace Barotrauma.Networking
 
             graphs[(int)NetStatType.ResentMessages].Draw(spriteBatch, rect, null, 0.0f, Color.Red);
 
-            spriteBatch.DrawString(GUI.SmallFont, "Max received: "+graphs[(int)NetStatType.ReceivedBytes].LargestValue()+" bytes/s", 
+            spriteBatch.DrawString(GUI.SmallFont, "Peak received: "+graphs[(int)NetStatType.ReceivedBytes].LargestValue()+" bytes/s", 
                 new Vector2(rect.X + 10, rect.Y+10), Color.Cyan);
 
-            spriteBatch.DrawString(GUI.SmallFont, "Max sent: " + graphs[(int)NetStatType.SentBytes].LargestValue() + " bytes/s",
+            spriteBatch.DrawString(GUI.SmallFont, "Peak sent: " + graphs[(int)NetStatType.SentBytes].LargestValue() + " bytes/s",
                 new Vector2(rect.X + 10, rect.Y + 30), Color.Orange);
 
-            spriteBatch.DrawString(GUI.SmallFont, "Max resent: " + graphs[(int)NetStatType.ResentMessages].LargestValue() + " messages/s",
+            spriteBatch.DrawString(GUI.SmallFont, "Peak resent: " + graphs[(int)NetStatType.ResentMessages].LargestValue() + " messages/s",
                 new Vector2(rect.X + 10, rect.Y + 50), Color.Red);
         }
     }
diff --git a/Subsurface/Source/Networking/NetworkEvent.cs b/Subsurface/Source/Networking/NetworkEvent.cs
index 021ce3974..0f97eeea5 100644
--- a/Subsurface/Source/Networking/NetworkEvent.cs
+++ b/Subsurface/Source/Networking/NetworkEvent.cs
@@ -93,7 +93,15 @@ namespace Barotrauma.Networking
 
             message.Write(id);
 
-            e.FillNetworkData(eventType, message, data);
+            try
+            {
+                if (!e.FillNetworkData(eventType, message, data)) return false;
+            }
+
+            catch
+            {
+                return false;
+            }
 
             return true;
         }
diff --git a/Subsurface/Source/Networking/NetworkMember.cs b/Subsurface/Source/Networking/NetworkMember.cs
index bb9d01277..729d14b98 100644
--- a/Subsurface/Source/Networking/NetworkMember.cs
+++ b/Subsurface/Source/Networking/NetworkMember.cs
@@ -8,6 +8,8 @@ namespace Barotrauma.Networking
 {
     enum PacketTypes
     {
+        Unknown,
+
         Login,
         LoggedIn,
         LogOut,
@@ -26,7 +28,12 @@ namespace Barotrauma.Networking
 
         NetworkEvent,
 
-        Traitor
+        Traitor,
+
+        ResendRequest,
+        ReliableMessage,
+        Ack
+        
     }
 
     class NetworkMember
diff --git a/Subsurface/Source/Networking/ReliableSender.cs b/Subsurface/Source/Networking/ReliableSender.cs
new file mode 100644
index 000000000..a16ed7b1d
--- /dev/null
+++ b/Subsurface/Source/Networking/ReliableSender.cs
@@ -0,0 +1,404 @@
+using Lidgren.Network;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+
+namespace Barotrauma.Networking.ReliableMessages
+{
+
+    class ReliableChannel
+    {
+        ReliableSender sender;
+        ReliableReceiver receiver;
+
+        public ReliableChannel(NetPeer host)
+        {
+            sender = new ReliableSender(host);
+            receiver = new ReliableReceiver(host);
+        }
+
+        public ReliableMessage CreateMessage(int lengthBytes = 0)
+        {
+            return sender.CreateMessage();
+        }
+
+        public void SendMessage(ReliableMessage message, NetConnection receiver)
+        {
+            sender.SendMessage(message, receiver);
+        }
+
+        public void HandleResendRequest(NetIncomingMessage inc)
+        {
+            sender.HandleResendRequest(inc);
+        }
+
+        public void HandleAckMessage(NetIncomingMessage inc)
+        {
+            //make sure we've received what's been sent to us, if not, rerequest
+            receiver.HandleAckMessage(inc);
+        }
+
+        public bool CheckMessage(NetIncomingMessage inc)
+        {
+            return receiver.CheckMessage(inc);
+        }
+
+        public void Update(float deltaTime)
+        {
+            sender.Update(deltaTime);
+            //update receiver to rerequest missed messages
+            receiver.Update(deltaTime);
+        }
+
+    }
+
+    internal class ReliableSender
+    {
+        private List<ReliableMessage> messageBuffer;
+
+        private ushort messageCount;
+
+        private NetPeer sender;
+
+        private NetConnection recipient;
+
+        private float ackTimer;
+
+        public ReliableSender(NetPeer sender)
+        {
+            this.sender = sender;
+            
+            messageBuffer = new List<ReliableMessage>();
+        }
+
+        public ReliableMessage CreateMessage()
+        {
+            if (messageCount == ushort.MaxValue) messageCount = 0;
+            messageCount++;
+
+            NetOutgoingMessage message = sender.CreateMessage();
+
+            var reliableMessage = new ReliableMessage(message, messageCount);
+            messageBuffer.Add(reliableMessage);
+
+            message.Write((byte)PacketTypes.ReliableMessage);
+            message.Write(messageCount);
+            
+            while (messageBuffer.Count>100)
+            {
+                messageBuffer.RemoveAt(0);
+            }
+
+            return reliableMessage;
+
+            //server.SendMessage(msg, server.Connections, NetDeliveryMethod.Unreliable, 0);
+        }
+
+        public void SendMessage(ReliableMessage message, NetConnection connection)
+        {
+            message.SaveInnerMessage();
+
+            sender.SendMessage(message.InnerMessage, connection, NetDeliveryMethod.Unreliable, 0);
+
+            recipient = connection;
+        }
+
+        //        NetOutgoingMessage msg = server.CreateMessage();
+        //reliableSender.CreateMessage(msg);
+        //msg.Write((byte)PacketTypes.Chatmessage);
+        //msg.Write((byte)type);
+        //msg.Write(message);
+
+
+
+        public void HandleResendRequest(NetIncomingMessage inc)
+        {
+            ushort messageId = inc.ReadUInt16();
+
+            Debug.WriteLine("received resend request for msg id "+messageId);
+
+            ResendMessage(messageId, inc.SenderConnection);
+        }
+
+        private void ResendMessage(ushort messageId, NetConnection connection)
+        {
+            ReliableMessage message = messageBuffer.Find(m => m.ID == messageId);
+            if (message == null) return;
+
+            Debug.WriteLine("resending " + messageId);
+
+
+            NetOutgoingMessage resendMessage = sender.CreateMessage();
+            message.RestoreInnerMessage(resendMessage);
+
+            sender.SendMessage(resendMessage, connection, NetDeliveryMethod.Unreliable);
+        }
+
+        public void Update(float deltaTime)
+        {
+            if (recipient == null) return;
+
+            ackTimer -= deltaTime;
+
+            if (ackTimer > 0.0f) return;
+
+            Debug.WriteLine("Sending ack message: "+messageCount);
+
+            NetOutgoingMessage message = sender.CreateMessage();
+            message.Write((byte)PacketTypes.Ack);
+            message.Write(messageCount);
+
+            sender.SendMessage(message, recipient, NetDeliveryMethod.Unreliable);
+
+            ackTimer = Math.Max(recipient.AverageRoundtripTime, 1.0f);
+        }
+    }
+
+    internal class ReliableReceiver
+    {
+        ushort lastMessageID;
+
+        Dictionary<ushort, MissingMessage> missingMessages;
+
+        private NetPeer receiver;
+
+        private NetConnection recipient;
+
+        public ReliableReceiver(NetPeer receiver)
+        {
+            this.receiver = receiver;
+            
+            missingMessages = new Dictionary<ushort,MissingMessage>();
+        }
+
+        public void Update(float deltaTime)
+        {
+            foreach (var message in missingMessages.Where(m => m.Value.ResendRequestsSent>10).ToList())
+            {
+                missingMessages.Remove(message.Key);
+            }
+
+            foreach (KeyValuePair<ushort, MissingMessage> valuePair in missingMessages)
+            {
+                MissingMessage missingMessage = valuePair.Value;
+
+                missingMessage.ResendTimer -= deltaTime;
+
+                if (missingMessage.ResendRequestsSent==0
+                    || missingMessage.ResendTimer<0.0f)
+                {                    
+                    Debug.WriteLine("rerequest "+missingMessage.ID+" (try #"+missingMessage.ResendRequestsSent+")");
+
+                    NetOutgoingMessage resendRequest = receiver.CreateMessage();
+                    resendRequest.Write((byte)PacketTypes.ResendRequest);
+                    resendRequest.Write(missingMessage.ID);
+
+                    receiver.SendMessage(resendRequest, recipient, NetDeliveryMethod.Unreliable);
+
+
+                    missingMessage.ResendTimer = Math.Max(recipient.AverageRoundtripTime, 0.2f);
+                    missingMessage.ResendRequestsSent++;
+                }
+            }
+
+        }
+        
+        public bool CheckMessage(NetIncomingMessage message)
+        {
+            recipient = message.SenderConnection;
+
+            ushort id = message.ReadUInt16();
+
+            Debug.WriteLine("received message ID " + id + " - last id: " + lastMessageID);
+
+            //wrapped around
+            if (Math.Abs((int)lastMessageID - (int)id) > ushort.MaxValue / 2)
+            {
+                //id wrapped around and we missed some messages in between, rerequest them
+                if (lastMessageID<=ushort.MaxValue && id>1)
+                {
+                    for (ushort i = (ushort)(Math.Min(lastMessageID, (ushort)(ushort.MaxValue-1)) + 1); i < ushort.MaxValue; i++)
+                    {
+                        //message already marked as missed, continue
+                        if (missingMessages.ContainsKey((i))) continue;
+
+                        Debug.WriteLine("added " + i + " to missed");
+                        missingMessages.Add(i, new MissingMessage((ushort)i));
+                    }
+                    for (ushort i = 1; i < id; i++)
+                    {
+                        //message already marked as missed, continue
+                        if (missingMessages.ContainsKey((i))) continue;
+
+                        Debug.WriteLine("added " + i + " to missed");
+                        missingMessages.Add(i, new MissingMessage((ushort)i));
+                    }
+
+                    lastMessageID = id;
+                }
+                //we already wrapped around but the message hasn't, check if it's a duplicate
+                else if (lastMessageID < ushort.MaxValue / 2 && id > ushort.MaxValue / 2 && !missingMessages.ContainsKey(id))
+                {
+                    Debug.WriteLine("old already received message, ignore");
+                    return false;
+                }
+                else
+                {
+                    if (missingMessages.ContainsKey(id))
+                    {
+                        Debug.WriteLine("remove " + id + " from missed");
+                        missingMessages.Remove(id);
+                    }
+                }
+            }
+            else
+            {
+                if (id>lastMessageID+1)
+                {                
+                    for (ushort i = (ushort)(lastMessageID+1); i < id; i++ )
+                    {
+                        //message already marked as missed, continue
+                        if (missingMessages.ContainsKey((i))) continue;
+
+                        Debug.WriteLine("added "+i+" to missed");
+                        missingMessages.Add(i, new MissingMessage((ushort)i));  
+                    }
+
+                }
+                //received an old message and it wasn't marked as missed, lets ignore it
+                else if (id<=lastMessageID && !missingMessages.ContainsKey(id))
+                {
+                    Debug.WriteLine("old already received message, ignore");
+                    return false;
+                }
+                else
+                {
+                    if (missingMessages.ContainsKey(id))
+                    {
+                        Debug.WriteLine("remove "+id+" from missed");
+                        missingMessages.Remove(id);
+                    }
+                }
+
+                lastMessageID = Math.Max(lastMessageID, id);
+            }
+
+            return true;
+        }
+
+        public void HandleAckMessage(NetIncomingMessage inc)
+        {
+            int messageId = inc.ReadUInt16();
+
+            recipient = inc.SenderConnection;
+
+            //id matches, all good
+            if (messageId == lastMessageID)
+            {
+
+                Debug.WriteLine("Received ack message: " + messageId + ", all good");
+                return;
+            }
+
+            if (lastMessageID > messageId)
+            {
+                //shouldn't happen: we have somehow received messages that the other end hasn't sent
+                Debug.WriteLine("Reliable message error - recipient last sent: " + messageId + " (current count " + lastMessageID + ")");
+                return;
+            }
+
+            Debug.WriteLine("Received ack message: " + messageId + ", need to rerequest messages");
+
+            if (lastMessageID > ushort.MaxValue / 2 && messageId < short.MaxValue / 2)
+            {
+                for (ushort i = (ushort)Math.Min((int)lastMessageID + 1, ushort.MaxValue); i <= ushort.MaxValue; i++)
+                {
+
+                    if (!missingMessages.ContainsKey(i)) missingMessages.Add(i, new MissingMessage(i));       
+                }
+
+                for (ushort i = 1; i <= messageId; i++)
+                {
+                    if (!missingMessages.ContainsKey(i)) missingMessages.Add(i, new MissingMessage(i));
+                }
+            }
+            else
+            {
+                for (ushort i = (ushort)Math.Min((int)lastMessageID+1, ushort.MaxValue); i <= messageId; i++)
+                {
+
+                    if (!missingMessages.ContainsKey(i)) missingMessages.Add(i, new MissingMessage(i));  
+                }
+            }
+
+
+
+            //    Debug.WriteLine("received recent request for msg id " + messageId);
+
+            //ReliableMessage message = messageBuffer.Find(m => m.ID == messageId);
+            //if (message == null) return;
+
+            //NetOutgoingMessage resendMessage = sender.CreateMessage();
+            //message.RestoreInnerMessage(resendMessage);
+
+            //sender.SendMessage(resendMessage, inc.SenderConnection, NetDeliveryMethod.Unreliable);
+        }
+    }
+
+    internal class MissingMessage
+    {
+        private ushort id;
+
+        public byte ResendRequestsSent;
+
+        public float ResendTimer;
+
+        public ushort ID
+        {
+            get { return id; }
+        }
+        
+        public MissingMessage(ushort id)
+        {
+            this.id = id;
+        }
+    }
+    
+    class ReliableMessage
+    {
+        private NetOutgoingMessage innerMessage;
+        private ushort id;
+
+        private byte[] innerMessageBytes;
+
+        public NetOutgoingMessage InnerMessage
+        {
+            get { return innerMessage; }
+        }
+
+        public ushort ID
+        {
+            get { return id; }
+        }
+
+
+        public ReliableMessage(NetOutgoingMessage message, ushort id)
+        {
+            this.innerMessage = message;
+            this.id = id;
+        }
+
+        public void SaveInnerMessage()
+        {
+            innerMessageBytes = innerMessage.PeekBytes(innerMessage.LengthBytes);
+            //innerMessage = null;
+        }
+
+        public void RestoreInnerMessage(NetOutgoingMessage message)
+        {
+            message.Write(innerMessageBytes);
+        }            
+    }
+}
diff --git a/Subsurface/Source/Screens/ServerListScreen.cs b/Subsurface/Source/Screens/ServerListScreen.cs
index 33e334f9e..379ffcfbb 100644
--- a/Subsurface/Source/Screens/ServerListScreen.cs
+++ b/Subsurface/Source/Screens/ServerListScreen.cs
@@ -287,8 +287,8 @@ namespace Barotrauma
 
             if (serverList.Selected!=null && (serverList.Selected.GetChild("password") as GUITickBox).Selected)
             {
-                var msgBox = new GUIMessageBox("Password required", "");
-                var passwordBox = new GUITextBox(new Rectangle(0,0,150,20), Alignment.BottomCenter, GUI.Style, msgBox);
+                var msgBox = new GUIMessageBox("Password required:", "");
+                var passwordBox = new GUITextBox(new Rectangle(0,40,150,25), Alignment.TopLeft, GUI.Style, msgBox);
                 passwordBox.UserData = "password";
 
                 var okButton = msgBox.GetChild<GUIButton>();                
diff --git a/Subsurface/changelog.txt b/Subsurface/changelog.txt
index 8c9517226..c6d7790bc 100644
--- a/Subsurface/changelog.txt
+++ b/Subsurface/changelog.txt
@@ -1,3 +1,24 @@
+---------------------------------------------------------------------------------------------------------
+v0.2.2
+---------------------------------------------------------------------------------------------------------
+
+Multiplayer:
+	- network statistics view which can be enabled by opening the debug console (F3) and entering "netstats"
+	(only works if you're running a server)
+	- updated to latest version of Lidgren networking library, which may or may not have an effect 
+	on the chat lag issues
+
+Items:
+	- fixed some game-crashing bugs related to detaching and attaching items (such as buttons)
+	- railgun shells can be bought in single player
+
+Submarine:
+	- more tools, diving suits and misc supplies in both default subs
+
+Misc:
+	- fixed Moloch spawning inside the level in the tutorial
+	- the launcher shows an error message instead of crashing if it can't connect to the update server
+
 ---------------------------------------------------------------------------------------------------------
 v0.2.1
 ---------------------------------------------------------------------------------------------------------
diff --git a/Subsurface_Solution.v12.suo b/Subsurface_Solution.v12.suo
index cb424628c..45a8ce9b4 100644
Binary files a/Subsurface_Solution.v12.suo and b/Subsurface_Solution.v12.suo differ