Atlantic Ferry, a 1941 film with the alternate title Sons of the Sea
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Dufaycolor was used in only two British-made feature films; Radio Parade of 1935 (1934) for two sequences, and Sons of the Sea (1939), an all-color film directed by Maurice Elvey.
The funding and first crossing of Britannia were key plot elements in a Warner Brothers film released in 1941 as Atlantic Ferry in the U.K., and Sons of the Sea in the U.S.