Assault on a Queen

Assault on a Queen is a 1966 American actionadventure film, directed by Jack Donohue, starring Frank Sinatra and Italian beauty Virna Lisi. Based on a 1959 novel by Jack Finney, it was adapted for the screen by Rod Serling and released by Paramount Pictures on June 15, 1966.

The recovery of the sub results in a plot devised by Eric Lauffnauer, a Uboat officer during the war, to pull a daring milliondollar heist on the British ocean liner Queen Mary, which he and the others plan to rob on the high seas while the liner is making a transatlantic crossing.Brittain gets the sub in working order with the assistance of his own partner, Linc, and a new man, Moreno, a war hero and expert with engines. Disguised as officers from a British vessel on a topsecret mission, Brittain, Rossiter and Lauffnauer board the Queen Mary, where they seize the bullion in the cargo hold. The captain complies after the pirates threaten to open fire on the ship and its civilian passengers. ........

Source: Wikipedia