Expedition Unknown - Season 18

1. Hunt for World War II Hellships

Aired: 6/24/2026

Josh searches for lost Allied soldiers on the Hofuku Maru, a Japanese Hellship.

2. Finding World War II's Lost Prisoners

Aired: 7/1/2026

A deep-water dive leads to the historic discovery of a lost WWII hell ship, 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.

3. Death Jars of Laos

Aired: 7/8/2026

Josh Gates treks into the remote jungles of Laos to investigate the mysterious Plain of Jars. Navigating landscapes still littered with unexploded ordnance, he uses advanced technology to uncover the secrets of this ancient, lost civilization.

4. Sunken City of Pirates

Aired: 7/15/2026

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

5. Secrets of Mexico's Underworld

Aired: 7/22/2026

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.

6. Inca Treasure Tunnels

Aired: 8/5/2026

Josh helps discover and explore a labyrinth of lost tunnels. He dodges traffic to assist in a first-ever radar scan below the busy streets of Cuzco, Peru. He joins them as they push into the tunnels and find priceless ancient treasures.

7. Chasing Civil War Gold

Aired: 8/12/2026

Josh hunts for millions in missing Confederate gold. First, he follows a new lead and explores a wagon train robbery site where gold and silver coins vanished. Then, an eyewitness account points to the location of Jefferson Davis's lost war chest.

8. Episode 8