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Trivia
The footage of the submarine 'Mother One' breaking through the ice was borrowed from the movie Ice Station Zebra (1968); both subs are numbered 509. See more...
Factual error: The two helicopters arrive at the ice floe seconds after Gant has taken off in the Firefox. None of the pilots or observers hear or see the receding aircraft or its exhaust trail? None of them see the runway flattened out in the surface of the ice? It would be visible! Are people with such poor eyesight allowed to fly helicopters?
Continuity: As Gant is pulling the Firefox out of the hangar, it is still very dark, as in pre-dawn. But as the Russian officers are shown shooting and watching the Firefox take off, it is suddenly much lighter outside as if it is after dawn and the sun can even be seen. But it would have taken 30-60 minutes for the light level to change that much.






