RedactedNarrative: On 8/12/15 at approx 1418 hours i responded to the area of keybox beach just south of dewey beach regarding a vessel that had went up on the beach. I arrived and was notified by sgt. that all persons onboard were 10-1 onshore. The vessel was on the beach with the bilge pump running. Shortly after tow boat us arrived to remove the vessel from the water and tow back to the dry stacks indian river inlet. During the tow the vessel was monitored and a pump placed to remove the water. When pulled the water was coming through the delaminated section of the fiberglass (see drawing). I was advised by o-1 that they were enroute to o.c. maryland from cape may. About 2 miles out he noticed the engines sounding odd. When he checked the cabin he noticed the water and changed course to shore. There were no injuries and all pob were accounted for. The extent of the damage was the hull fiberglass delaminating and water damage to interior (see photos).