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A group of WWII-era scientists used themselves as guinea pigs to learn to breathe underwater. Their experiments helped make D-Day possible.

A group of WWII-era scientists used themselves as guinea pigs to learn to breathe underwater. Their experiments helped make D-Day possible.
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WWII Scientists Learned to Breathe Underwater, Helped With D-Day

During WWII, scientists breathed CO2, oxygen, and other gases to learn about diving and submarine travel. They helped make D-Day happen. ....

United Kingdom , John Burdon Sanderson Haldane , Rachel Lance , Chamber Divers , University College London , Royal Navy , Untold Story , British Admiralty , Martin Case ,