RedactedNarrative: Vessel was in rough water all day which caused the stern part of the cap to become separated from the hull.  Water was entering through the gap and while heading to the city ramp the vessel became swamped.  The operator steered it towards land where it rested on the bottom in two foot of water.  There was a small gas leak and a sheen on the water, so DEP and the Fire Department were advised.  After the wind calmed down the vessel was bilged out and loaded up on trailer.  The registered owner did not have insurance and would repair the vessel himself.