John Ford directed this early sound film programmer that is short on any kind of plot that makes sense but crackles with high seas action.
In this World War I yarn, unflinching U.S. Navy Captain Bob Kingsley (George O' Brien -- all smugness and self-assurance) is in charge of a "mystery ship" -- a schooner posing as a merchant vessel decked out with an immense cannon hidden in a giant box -- sent out to hunt down notorious German U-Boat 172 and its dashing commander Franz Schiller (John Loder). It's not much of a secret since when they land in a Spanish port riddled with undercover German spies -- including the luscious blonde Anna Maria (Marion Lessing), who takes a liking to Bob but also happens to be Schiller's sister -- Schiller is there with his boat refueling. Nevertheless, Bob and Schiller continue with the gentlemanly art of war and when they run into each other in a cantina they toast each other with Schiller exiting with, "Until our next meeting." Meet they do, in a rousing battle on the open seas, submarines and ships sinking along with the plot.
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