The Momsen lung, a primitive WWII rebreather for escaping submarines.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...g_fullsize.jpg
Previously:
Transporting a submarine on a truck - GIF
Narco-submarine captured by U.S. Coast Guard - video and infographic
The H.L. Hunley, the first submarine to sink a warship
Submarine rescue chamber - photos
steam-powered submarine
Raising WWII German submarine U534 - videos
Guppy submarine torpedo room - photo
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