Sea level logic updated.

src/engine/objects/Zone.java

@@ -247,7 +247,9 @@ public class Zone extends AbstractGameObject {
         // Zone AABB is set here as it's coordinate space is world requiring a parent.
         this.setBounds();
 
-        if (ZoneManager.getSeaFloor().equals(this)) {
+        // Seafloor
+
+        if (this.parent == null) {
             this.seaLevel = 0;
             return;
         }