Scrooge buys up all the 1916 quarters ever minted and sinks all but one deep in the Atlantic, with the aim of making that one coin the most valuable in the world. But the last quarter is flattened by a steamroller and so Scrooge must dive into the Atlantic to get another. There, the ducks find Atlantis, a sunken city populated by fish-men who breathe under water.
Daisy Duck; Gladstone Gander; Uncle Scrooge; Donald Duck; Huey; Dewey and Louie
The ducks and Daisy get Scrooge's promise to match their twenty-five dollars for Christmas dinner and a toy train for the poor children of Shacktown. Scrooge is unable to deliver when the floor of his money bin collapses and his money falls deep into an unknown cavern, separated by only a thin crust from bottomless quicksand.