Crewman exits an escape hatch wearing the Momsen Lung emergency escape breathing device during the submarine�s sea trials in July, 1930.

Navy File Photo -- USS V-5 crewman A. L. Rosenkotter exits the submarines escape hatch wearing the "Momsen Lung" emergency escape breathing device during the submarines sea trials in July, 1930. The emergency breathing device was named for its inventor, U.S. Navy submarine rescue pioneer Cdr. Charles "Swede" Momsen. The submarine V-5 was later renamed USS Narwhal (SS 167). U.S. Navy photo. File# 030808-N-0000X-001