sentences:  Seawolf park is unique in that it has a submarine, the remains of a merchant ship, and a destroyer escort designed to conduct antisubmarine warfare—the hunter, hunted, and the protector—all in one museum area.It is the home of two preserved U.S. Navy ships, the "Gato"-class submarine and the "Edsall"-class destroyer escort , and the remains of the World War I tanker S.S. "Selma", the largest concrete ship constructed, can be seen northwest of the parks fishing pier at .Also preserved at the park is the conning tower of the "Balao"-class submarine and the sail of the "Sturgeon"-class nuclear attack submarine .