Well, I still can't chase this down. Got a couple battleships, sink one then try to fire at another through the debris field I hit rafts and boats with the fish set for 30 feet depth.
This is what it looks like under the debris field;
And same thing when launching a liferaft for a mission;
I have no idea what that's all about, the rafts used to flip over occasionally but they were always on the surface before. Now they launch 20-30 feet underwater.