RedactedNarrative: On 6-20-17 boat operator/owner reported that his auxiliary sailboat (diesel) engine lost power.  He used his head sail for propulsion to travel to the East Greenwich Mooring Field.  When he arrived to his assigned mooring, his boat's keel got entangled on an anchor line of adjacent occupied mooring.  A passerby in a power boat towed boat to his mooring.  He then secured his boat and departed the scene.  He returned on 6-27 to find seawater above the floor boards.  He pumped the water out and then cleared the area.  He returned on 6-29 and found the bilge submerged again in water.  He had the boat hauled to Prime Marina on 6-30 and was advised that there were cracks in the fiberglass along and above the keel to hull joint. Estimated damage reported at $20,000.00.