Correct RHB, the colder the water the longer it takes to 'eat' the remains of an airplane. So it depends on what depth the airplane lies. In tropical water the temperature does in general not decrease a lot at more depth, especially not when there is a constant and strong current causing even at deep places a water temperature only just a few degrees below the surface water temp. But I have seen remains from the WW2 at a depth of even only 44 meter (motor and some other metal parts). It's worthwhile IMHO to explore when more info is acknowledged of the place and depth. I'm in !