RedactedNarrative: Unoccupied vessel sunk at its dock slip. Vessel fully submerged except for bow anchor locker. Dock lines were still attached to dock. Fuel/ oil leakage contained by absorbent boom. Cause is heavy continuous rain over the course of days. Vessel raised by Sea Tow Western Long Island Sound, and towed to Mamaroneck Boats and Motors for haul-out.