Submarine escape lung

The Momsen lung was a primitive underwater breathing apparatus used in World War II by American submariners as emergency escape gear. Submariners would train in a 100-foot (30-meter) deep diving tank using this apparatus.

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The device was clumsy to use, and the British Navy instead adopted the practice of blow and go, an apparatus-free ascent technique in which the sailor would exhale during ascent in order to keep air from expanding in the lungs, which would cause them to rupture.

See also

• Charles Momsen
• Steinke hood