RedactedNarrative: On August 16th, 2014 at 1:00 p.m. vessel one LA 5281 EW (19' Bristol/remote steering) was heading north in Calcasiseu Lake towards Hebert's landing. Vessel one was being operated by Operator. Operator stated that the engine on vessel one started to malfunction and then stopped working, leaving vessel one adrift. The water conditions were choppy with one to two foot seas. Operator stated that the waves started to come over the stern of vessel one. Operator stated that the bilge pump on vessel one was not working as the vessel was taking on water. Operator then stated that vessel one started to list on its starboard side and then capsized. Operator stated that he and two other passengers swam thirty yards to the shoreline. At that time vessel one sank. Operator and others had their PFD's on when we arrived on scene. There were no injuries. I observed no signs of impairment on Operator. It was concluded that vessel one lost power and steerage causing its stern to turn around toward the seas. The waves broke over the stern causing vessel one to flood, capsize and sink.