A typical big budget mid 60s action adventure, made when Hollywood was worried about the increasing rise of TV and the fall in cinema box office receipts. It remains entertaining and fun today with a big cast and a stirring story of derring do, Cold War espionage and survival. Rock Hudson is the main star as a the captain of a US nuclear submarine sent on a hurried mission to the Arctic to save the crew of a US weather station after there's been a fire. But he soon realises there's more going on when he has to take along a British Intelligence Agent (Patrick McGoohan) and a Soviet defector (Ernest Borgnine). It all surrounds a typical movie 'maguffin' and director John Sturges, by this time a master of the epic big production, thrills us with taut scenes of the submarine navigating dangerously below the arctic ice and whilst the studio bound sets are a little false by today's standards this is a great film for a Saturday afternoon.