Josh chases the treasure of the infamous Spanish pirate Amaro Pargo; an exhaustive hunt of Pargo's stomping grounds in the Canary Islands leads Josh beneath an active volcano to dive for the pirate's hoard.

Josh helps recover the richest stash of lost treasure in the Americas; deploying cutting-edge technology and an armada of boats, the team dives the Caribbean to bring coins and jewels from the legendary Spanish galleon Maravillas to the surface.