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.

Josh searches for a top-secret WWII seaplane that crashed into the Pacific. Now, 70 years later, Josh joins a team scouring the ocean floor hundreds of feet below to find a lost aviation treasure -- the only XP5Y-1 still in existence.