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While filming Laurel & Hardy's Atoll K in 1950, Leo Joannon spent an entire week shooting atmosphere shots on an island, allegedly because he fell in love with the ocean. Twelve years earlier, Joannon likewise filled the screen with oceanic shots in Alerte en Mediterranee (Alert in the Mediterranean). The story concerns an uneasy alliance involving the French, German and English navies. A band of pirates has stolen a freighter containing a deadly cargo of poison gas, threatening to kill everyone on a hostage ocean liner. The three rival navies give chase, racing against the clock as the pirates' deadline approaches.