This episode of the CGI-driven National Geographic series digitally strips the water from famous wreck sites to show what divers and sonar alone cannot. The technique renders the seabed as dry terrain, letting maritime historians and marine archaeologists walk viewers through hulls, cargo holds, and scattered debris fields as if the ocean had simply vanished. The focus here is on the richest wrecks ever located, including a sunken battleship and treasure-laden ships lost in the China Seas, tracing how gold, porcelain, and coin cargoes ended up on the bottom and what their recovery has meant for salvage crews and historians alike. Interviews explain how sonar mapping and shipwreck records get translated into the show's signature dry-seabed visualizations, while the human stories behind each wreck, the crews, the cargo owners, the circumstances of sinking, ground the technology in actual loss. The result is part treasure-hunting narrative, part underwater engineering explainer.