RedactedNarrative: Vessel 1 was traveling northbound in the Gulf of Mexico approximately 1000 feet from shore when the vessel began taking on water. The operator of V1 stated the vessel seemed to slow down and become sluggish in the water. Within seconds a wave travelled over the bow of the vessel filling the boat with water. The vessel's engine then stopped and Operator was unable to start the engine again. The vessel continued to fill with water Operator then had the passengers put their life jackets on. Once the vessel was filled with water, Operator and passengers jumped off the boat and held onto the side of the boat in the water. The vessel then capsized Operator and the occupants then swam to shore safety. No one was injured in this accident and there were no other vessels involved.