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The onscreen credits note that the underwater scenes were photographed at Silver Springs, FL. After the onscreen credits there is a written prologue that states: "In 1513, Juan Ponce de Leon sought the Fountain of Youth in Florida. Today, if he were a wise old sailor, he'd settle for a bowl of "Conk" chowder. Our story is of the numberless Florida Keys of which Mercy Island is one and of the strangely aloof clan of "Conks" who fish the opalescent waters and are annoyed no end by the Outlanders who charter their boats." According to the film's pressbook, technical advisor Ross Allen was "world-famed as an alligator trainer and wrestler." He helped select locations to be shot in Florida and supervised sequences in which alligators appeared. According to Variety and Los Angeles Times news items, Theodore Pratt's book was purchased by Republic for $17,500 and the film was originally to star John Wayne. Cy Feuer and Walter Scharf received an Academy Award nomination in the Music (Music Score of a Dramatic Picture) category.