After foiling the Beagle Boys, Scrooge and his nephews decipher the strange marking on the map, which leads to a sunken treasure ship in Ronguay. However, Flintheart Glomgold (in his animated debut) and El Capitán are out to stop them at every turn. The story is loosely based on legends of Spanish Galleons being found in the SW American desert and Northern Mexico.
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