re: Flooded boat help

Absolutely do not try to crank it. A mechanic will have to make sure there is no water trapped anywhere. Depending on how well the boat was wired it may be ok, it's made to withstand a marine environment after all, but I wouldn't turn anything on unless you want to be chasing shorts around for months. The other concern is the hull, I know the industry has moved away from foam but if its in there it will be full of water. There's just too much that COULD be wrong to even begin to tell you how to start, your best bet is letting insurance handle it and if they say its yours to salvage then pull it to someone who knows what they're doing.