by Terminus: I would say no chance, as a boating person I have had 3 un scheduled swims with smartphones and their behaviour has been identical in salt water, they go off instantly and don't respond to anything,then get hot as they short circuit, the flash comes on then the device finally dies within 30 minutes.
Nevertheless, there is a good chance the non-volatile memory would retain its data which could potentially be recovered. If you'd broken your phone by going for a swim you wouldn't bother because the phone is not economically recoverable - but if it's a question of recovering data for a crash investigation that's another matter.