With the USS Squalus trapped at the bottom of the ocean, the Navy mounted an all-out rescue effort to save its crew before they ran out of breathable air. They called upon Charles “Swede” Momsen, an engineer who’d been pushing the Navy for years to develop new technology to rescue sunken submarines. While top brass considered Momsen a “rebel in uniform,” his ingenious invention — a rescue diving bell — soon became the Navy’s only hope.

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