The Key

The name of this movie is The Key released in 1958-05-28 and it's main theme is In wartime England, circa 1941, poorly-armed tugs are sent into U-Boat Alley to rescue damaged Allied ships. An American named David Ross arrives to captain one of these tugs. He's given a key by a fellow tugboat-man -- a key to an apartment and its pretty female resident. Should something happen to the friend, Ross can use the key..