Characters that are outside are rendered under particles -> creatures can be hidden by smoke from hydrothermal vents.

Barotrauma/BarotraumaShared/Source/Map/Submarine.cs

@@ -151,12 +151,14 @@ namespace Barotrauma
 
         public Rectangle Borders
         {
-            get 
-            { 
-                return subBody.Borders;                
-            }
+            get { return subBody.Borders; } 
         }
-        
+
+        public Rectangle WorldBorders
+        {
+            get { return SubBody.WorldBorders; }
+        }
+
         public override Vector2 Position
         {
             get { return subBody==null ? Vector2.Zero : subBody.Position - HiddenSubPosition; }

Barotrauma/BarotraumaShared/Source/Map/SubmarineBody.cs

@@ -39,6 +39,12 @@ namespace Barotrauma
             get;
             private set;
         }
+
+        public Rectangle WorldBorders
+        {
+            get;
+            private set;
+        }
                 
         public Vector2 Velocity
         {
@@ -181,6 +187,10 @@ namespace Barotrauma
 
         public void Update(float deltaTime)
         {
+            var worldBorders = Borders;
+            worldBorders.Location += MathUtils.ToPoint(Position);
+            WorldBorders = worldBorders;
+
             if (GameMain.Client != null)
             {
                 if (memPos.Count == 0) return;
@@ -232,9 +242,6 @@ namespace Barotrauma
             //if outside left or right edge of the level
             if (Position.X < 0 || Position.X > Level.Loaded.Size.X)
             {
-                Rectangle worldBorders = Borders;
-                worldBorders.Location += MathUtils.ToPoint(Position);
-
                 //push the sub back below the upper "barrier" of the level
                 if (worldBorders.Y > Level.Loaded.Size.Y)
                 {