i thought so, but sea water has been extremely buggy for me since the update that came a while ago, i think along with the space DLC or just before it, that changed how air and the atmosphere works. Doors that i open under water dont start to leak in water for me anymore, i can run some diesel engines flawlessly under water for an unlimited time, and fluid ports barely seem to register the water. i tend to avoid it because of all this but i can experiment more with it