Summary:In May 1939, the USS Squalus submarine sank 240 feet below the surface, trapping 33 sailors in total darkness at the ocean floor. With oxygen running out, freezing temperatures setting in, and the crushing weight of the deep pressing against the hull, hope seemed lost. But one man, Charles "Swede" Momsen, had spent his career preparing for this moment. His invention—the McCann Rescue Chamber—would be put to the test in the first-ever deep-sea submarine rescue. What followed was a race against time, battling the ocean’s deadly pressure, equipment failures, and the unknown. Would they make it to the surface alive, or would the Squalus become their final resting place?