RedactedNarrative: Vessel 1 was adrift w/o motors running. Deceased on vessel voluntarily went for a swim off of vessel. Decease was not wearing a PFD. Deceased was swept under vessel by current while trying  to re-enter the boat from the water via transom ladder. Deceased was under vessel for several moments before being brought on board unconscious, unresponsive with no pulse. CPR immediately started by vessel occupants to no success. Deceased transferred to PD Marine Unit and transported to awaiting EMS units on shore.