RedactedNarrative: Vessel was not under power and was not anchored.  There were large waves at the time and the Operator had the bow of the vessel going with the waves.  Operator and Passenger began to notice the vessel taking on water and the Operator attempted to start the boat, but was not able to.  The vessel continued to take on water until it sank.  The Vessel was towed to shore.  There were no injuries.