I would also guess it was your starter. I took on quite a bit of water my fist time out with my 05 Mobius because either the factory or dealer did not hook up the discharge on the recirc pump. Didn't get any in the engine itself, but after a few more trips to the lake the starter was gone. That was only with water sloshing against it. I can imagine if it was submersed for that long that it is toast.