I can say you this:
My Red Jed 4 is sunk because 4 meter waves on the atlantik was to much. If the ship is under water, you cannot stear, you cannot go on the bridge, on you cannot walk around. The ship is gone and the cams are fixed on the place over the water. Also the Red Jet was sinking very quickly in this situation. I think you can try this also. Start a free mission with 4m waves on atlantik and use the redjet. Sometimes it sinks sometimes not.
strassenkreuzer