Expedition Unknown

Josh searches for more than 1,000 POWs lost in the Pacific Theater. He dives to find lost Allied soldiers on the Hōfuku Maru, a notorious Japanese "Hellship." Then, Josh receives unprecedented access to join a U.S. Department of Defense recovery mission.

A deep-water dive leads to the historic discovery of a lost WWII hellship, where an estimated 1,000 soldiers made the ultimate sacrifice. Given rare access, Josh assists a U.S. Department of Defense mission, recovering potential remains of American POWs.

Deep in the jungles of Laos, Josh must detonate unexploded ordnance from the Vietnam War before he can search for a lost culture's burial jars. Cutting-edge 3D scanning and facial recognition tech could finally shed light on this mysterious civilization.

A first-ever sonar survey reveals a submerged pirate lair located off the coast of Jamaica. Using groundbreaking photogrammetry, Josh dives in to hunt for the stolen treasure of Black Bart, the King of Pirates -- a fortune worth $50 million.

Josh joins archeologists as they bushwhack through thick jungles and rappel into vast caves in search of the lost Zoque culture. Deep underground, the team pushes through flooded sections and finds thousands of ritual offerings that may solve the mystery.