Caption:
USS V-5 (SC-1) crewman A. L. Rosenkotter exits the submarine’s escape hatch wearing the Momsen Lung emergency escape breathing device during the submarine’s sea trials in July, 1930. The emergency breathing device was named for its inventor, U.S. Navy submarine rescue pioneer Commander Charles (Swede) Momsen. The submarine V-5 was later renamed USS Narwhal (SS-167). U.S. Navy, photographer unknown, 1930 (cropped and cleaned).