The state Division of Fish & Wildlife sank the former Army and Navy ship Shearwater on the Del-Jersey-Land Reef.

Shearwater was sunk in the square-mile area comprising the Del-Jersey-Land Reef, about 26 nautical miles southeast of Indian River Inlet.

Delaware’s artificial reef system includes more than 1,300 former New York City subway cars, tugboats, small commercial fishing boats, decommissioned military vehicles and the ex-USS Arthur W. Radford.

Delaware Reef Program Coordinator Jeff Tinsman said the 71-year-old Shearwater underwent extensive environmental cleanup, including removal of interior paneling and insulation from the ship’s superstructure and emptying all fuel tanks, sanitation equipment and lines and hydraulic fluids.