In August 1942, over 7,000 Allied troops stormed the beaches of Normandy, France, in a largely forgotten landing, with only a small fraction surviving unscathed. The raid failed due to poor planning and lack of underwater reconnaissance, which left the Allies unaware of strong German coastal defenses and underwater obstacles. Inadequate submersible technology prevented effective pre-landing surveys, leading to heavy casualties and the inability to secure a foothold. Scientists had a rudimentary grasp of mixing air for prolonged underwater survival, with limited rebreather technology, poor understanding of oxygen toxicity, and inadequate gas supply systems.

Two summers before D-Day, the Allies realized they desperately needed underwater intelligence to succeed in another beach invasion and win the war. Led by controversial biologists J.B.S. Haldane and Dr. Helen Spurway, an ingenious team of ragtag scientists worked in makeshift labs throughout the London Blitz. Amid a rain of bombs, they pioneered groundbreaking advances in underwater reconnaissance through painful and potentially fatal self-experiments. Their discoveries enabled the safe use of miniature submarines and breathing apparatuses, ultimately allowing the Allies to take the beaches of Normandy.

Blast-injury specialist Dr. Rachel Lance, author of Chamber Divers: The Untold Story of the D-Day Scientists Who Changed Special Operations Forever, joined us a few years ago to discuss the CSS Hunley, a Confederate submersible used during the American Civil War, the first submarine to sink an enemy ship in combat. We explore these experiments while bringing to life the men and women whose brilliance and self-sacrifice shaped the war’s outcome, including the danger they faced in their quest to enable Allied troops to breathe underwater.

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