Water Sucked Into Engine...Hydro Lock, Whats The Damage ??

Water Sucked Into Engine, Hydro Lock, Whats The Damage. the car was drove into flood water..the engine cut out..after the water was cleared from the engine it restarted and apparently drove fine. a few weeks later the engine started clattering and running on three cylinders so i thought i would strip the engine to view the damage.