Under the command of Captain Brunel (Omar Sharif) the ocean liner Britannic sets off on it's first voyage after a refit, the passengers barely entertained by hapless entertainment officer Curtain (Roy Kinnear) though the incredibly rough seas don't help. Soon, however there is some excitement. A mad man contacts the shipping line to tell them various booby trapped bombs are aboard, and unless he receives a couple of suitcases full of cash the bombs will go off sinking the liner and all aboard her.
While the police in the form of McCleod (Anthony Hopkins) try and hunt down the bomber, expert bomb disposal officer Fallon (Richard Harris) and his team and parachuted into the Atlantic and clamber aboard the liner. With the timers fast counting down Harris and his team desperately try and defuse the incredibly complicated bombs before it's too late...
A great film with a brilliant cast. The bomb disposal scenes make great use of close-ups. The final twist is delicious.