Submarine alert (1943) is an American film directed by Frank McDonald (director), produced by Pine-Thomas Productions and released by Paramount Pictures. The film was the last in a series of three Pine-Thomas adventure films that included Forced Landing (film) (1941) and Flying Blind (film) (1941). The film stars Richard Arlen, Wendy Barrie, Nils Asther, Roger Pryor, Marc Lawrence and Ralph Sanford.
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