Oh nooooo ... the engine has got water in the cylinder bores and the pistons cant compress it .. hence the clunk as a long shot you could try and turn the engine anti clockwis ..with a socket on the crank pulley to relieve some of the pressure and then remove the injectors make sure nobody is any where near the vehicle and try and crank it over it may pump the water out of the bores ...but BEWARE it will pump out under EXTREME pressure and would do serious damage to anyone that it hit !
If that works try and start the engine but remove the air filter and trunking that may still have water in it.... because if it fires up and then it sucks water in again your luck will run out !!! ( the turbo intercooler will be full of water also ) hope this helps a bit ..fingers crossed but the engine is more than likely totaled i am afraid
