Lt. Charles Momsen instructs sailors on use of Momsen Lung and sailors go through lung training exercise in water tank in 1930

Title card: "Use Diving Tower to Teach Tars to Escape from Subs New London, Conn. - Lt. Momsen trains men in use of "Lung" / Lt. Charles Momsen standing outside in group of nine sailors instructs them on the Momsen Lung and submarine escape / Pan up water tower / Momsen shows blackboard drawing of water tank and shows men how Momsen lung training exercise will work / Intertitle: "Entering the decompression chamber" / men in bathing suits enter decompression chamber, hatch closes and latches behind them / sailor with tattoo on arm adjusts chamber pressure from outside chamber / men sitting in chamber pinch noses, yawn and rub ears / Intertitle : "Donning the Momsen Lung" / men hang Momsen lungs around necks then walk through hatch and close it / Intertitle: "Set to go -- from the bottom to the top" / man in water up to shoulder adjusts Momsen lung / blurry underwater shot / man pops up out of water and climb from tank / Note: exact day not known