| Rock Hudson | Cdr. James Ferraday |
| Ernest Borgnine | Boris Vaslov |
| Patrick McGoohan | David Jones |
| Jim Brown | Capt. Leslie Anders |
| Tony Bill | Lt. Russell Walker |
| Lloyd Nolan | Admiral Garvey |
A US submarine is dispatched to the frozen wastes of the North Pole to recover a Soviet satellite crammed full of strategic snapshots of US bases. The Cold War atmosphere becomes even chillier as the sub, with a Russian expatriate, a British secret agent and an American marine captain on board, is sabotaged en route.
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