RedactedNarrative: The operator and one passenger were traveling south in Sister Lake in Terrebonne Parish when the wind picked up causing high waves.  The operator advised that two or three waves came over the bow causing the vessel to take on a significant amount of water.  The operator stated the bilge pump came on immediately but was not strong enough to pump the water out fast enough.  The operator turned his vessel around to go with the waves and waves continued to come over his stern causing the vessel to sink completely below the waters surface.  The operator and his passenger then swam to the bank where they were able to call 911 and a friend to retrieve them.  The vessel was a total loss.  Alcohol is not suspected to be a contributing factor to the accident.  PFD’s were onboard but not worn.  A kill switch was in use at the time of the incident.  The vessels steering was remote steer.