In this thrilling true narrative of terror, heroism and courage in the depths of a malevolent ocean, prizewinning author Peter Maas brings us in vivid detail a blow-by-blow account of the disaster and its uncertain outcome. The sub was the Squalus. The man was a U.S. Navy officer, Charles "Swede" Momsen, an extraordinary combination of visionary, scientist and man of action. Until his advent, it was accepted that if a submarine went down, her crew was doomed. But Momsen, in the face of an indifferent, often sneering naval bureaucracy, battling red tape and disbelieving naysayers every step of the way, risked his own life again and again against the unknown in his efforts to invent and pioneer every escape and rescue device, every deep-sea diving technique, to save an entombed crew. With the crippled, partially flooded Squalus lost on the North Atlantic floor, Momsen faced his personal moment of truth: Could he actually pluck those men from a watery grave? Had all his work been in vain?