Scrooge, Donald, and the nephews risk an island's tabu for its black pearls, but almost immediately their ship is sucked from a lagoon into an underwater cavern. They plug a volcano to build up pressure to blow the boat out of the cavern.
Art submitted on March 14, 1957. Pages are three panels deep. Synopsis by Michael Barrier from "Carl Barks and the Art of the Comic Book" (M. Lilien, 1982).