High Quality Content by WIKIPEDIA articles! A submarine chaser is a small and fast naval vessel specially intended for anti-submarine warfare. Although similar vessels were designed and used by many nations, this designation was most famously used by ships built by the United States of America (US). Many of the US World War I sub-chasers found their way to friendly powers by way of Lend-Lease in World War II.United States submarine chasers were designed specifically to destroy German submarines in World War I, and Japanese and German submarines in World War II. The small 110-foot (34 m) patrol craft of the design first used in World War I with the hull designator SC. Their main weapon was the depth charge. They also carried machine guns and anti-aircraft guns. Larger 173-foot (53 m) sub chasers used the PC hull classification symbol (for Patrol, Coastal).