A vessel occupied three times was traveling in a southeast direction in the Potomac River when the vessel lost all power.  The operator checked the engine compartment and found it to be flooded.  The vessel filled with water as the operator and occupants donned their life jackets and abandoned ship in a self-inflating life raft.  The vessel sank in forty feet of water within five minutes of abandoning ship.  The investigating officer assumes the cause of the sinking to be mechanical.
Piney Point