- HD 1080
- Runtime: 90m.
- Status: Released
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- Languages: en
- Country: United States of America
- Director: John Ford
- Stars: George O’Brien, Marion Lessing, Mona Maris, Walter C. Kelly, Warren Hymer
- Production_studio: Fox Film Corporation
- Slogan: Thrill after thrill will hold you breathless in Fox Movietone Drama
- The Seas Beneath is featured in the top rankings of 1931
- #68 in Top Drama Movies of 1931
- #3 in Top Action Movies of 1931
- #5 in Top War Movies of 1931
In the waning days of WWI, a U.S. "Mystery Ship," sets sail for the coast of Spain towing a submarine. Their mission is to find and sink a U-boat that has been especially effective in attacking Allied shipping. Posing as a harmless schooner, the mystery ship is in fact fitted with a formidable gun capable of sinking a U-boat. Stopping in the Canary Islands to refuel, the crew interacts with locals involved with Germans, and with Germans themselves, including the sister of the U-Boat commander, who is lurking offshore waiting for the coming battle.