I know there are numerous threads about insurance here, but is it not now the case where most poicies won't cover flooding? I searched for a quite a while and never found a company that would cover flooding while diving... at least here in Canada. That one well-known outfit in the US (that I cn't remember) offered a policy but the premium was about $1000 a year. I figure that in the worst case, I am going to flood a body and one lens, or one strobe or something, so I simply accept that as part of the cost of the hobby.
If I suffer a total loss... stolen, case falls of boat/out of plane etc. I am covered.
A while back, I was working for a large camera store in Montreal, I was sharing an office with the guy in charge of handling insurance case, one thing that came up on occasion was the following. the person would water damage its equipment (housing flood, dropped in a puddle or what not), then the insurance company rep would request a repair estimate, which as you know, would confirm that the photo equipment was beyond economical repair,the the rep would pull the "I'm sorry, your policy does not cover repair" the catch is that, even if it is not repairable, it is still treated as a repair.
In some other case, water damaged was only covered if the damaged occurred inside the house!!! Been there, done that and got the f&^%ing T-shirt
So my advice is check with your insurance supplier and make this little detail clear with them.
If you ever flood and are in doubt, do like a friend of mine, go to the bow of the boat, shoot some imaginary dolphin with your flooded camera gear and then quietly dispose of it (in a safe and non polluting way), then proceed to see the Captain and just advise him that you camera just slipped from your hand and is now resting in Davey's locker, then claim the camera as a loss, (which should be covered)