A crew of seafaring Diggers falls on hard times. Marooned on a deserted island, their captain is dead and their ship is stolen; with it is a map detailing the whereabouts of a fabled treasure that is said to grant one's deepest desires. The crew licks its wounds, plots revenge, and looks for a way to get off that island to return to the open sea, where they can reclaim what was stolen, and finish what they started.