RedactedNarrative: Unit 1 was anchored with a bow anchor and stern anchor, at the beach at Sandy Point, at the northern end of Kiawah Island along the Stono Inlet.  The bow anchor broke loose.  The tide was flooding and the vessel spun around on the stern anchor.  The waves coming in from the ocean then started breaking over the transom of the vessel causing it to fill up with water and sink.  All three occupants were able to get off the vessel and swim to shore without any injuries.