Hmm... the blimp thing is most curious. I'll try to run some experiments and see what I get.
Regarding the sunken ships. Do you have way points set for those ships? You see, what I'm thinking is that is AI wrecks work, but yours do not, then perhaps it is something to do with the way the ships react to a collision. In the normal case (floating ships), if another unit gets too close, they will attempt to move. If the ship in moving reaches its last waypoint it can disappear (de-spawn or delete, that is).
What I'd suggest is that you check to make sure that your wreck is set to 0 knots, that it is checked as a "docked" unit (which disables the anti-collision AI) and that you give it a way point regardless of the fact it isn't going to go anywhere.
The next thing to check is that the wreck isn't too deep. The problem may be because there is some sort of fouling between the wreck and the seabed.
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