RedactedNarrative: While fishing at anchor 3 big waves came over the transom.  The pump could not keep up and vessel sank.  Damage to engine.  Broken bilge pump discharge hose.  Investigating officer upon inspection of the motor determined that the bilge hose was not connected property or had a hole in it therefore the water would not have been pumped overboard and went back into the boat.  It was also noticed at inspection that the vessel's plug was non standard and appeared to be a gas pipe fitting.  There was no capacity plate on the vessel but it is suspected that the weight of the passengers on board as well as the weight distribution could have contributed to this accident.  If a vessel passing by was not in the area to pull 3 men out of the water or have 2 climb on board they would probably have been fatalities involved in the accident.  Owner stated that all passengers put on pfd's but there were conflicting reports that only 2 men had pfd's on and the others were holding onto floating coolers.  Vessel was a total loss.l