RedactedNarrative: Vessel 1 was docked, bowed in and unoccupied at a slip at the Yacht Club. Vessel 1 was tied to the dock on its port side. Vessel 1 was docked and not used for approx. 2 weeks. Vessel transom hatch gasket appeared to be out of place and not properly working, and allowed water to enter into the bilge compartment area. This may have caused the fuse of the float / bilge switch to be blown and caused the bilge pump to not work. This caused the vessel to fill with water and become submerged and list on the port side. Marine Unit arrived on scene to de-water vessel and was towed to the Boat and Yacht Club boat lift by Sea Tow. Vessel was then removed from the water.