Underground Marvels
TVPG
Documentary
Uncovering subterranean phenomena around the globe and their impressive stories.
Cast & Crew
Upcoming TV Airings
The airings below are based on a generic national schedule. Times and dates can vary by TV provider.
Friday, July 18
Cincinnati's Secret Caverns
Season 2 • Episode 2
Deep beneath the streets of Cincinnati lies a network of deserted tunnels and caverns.
Friday, July 18
Hotel Bunker of the Apocalypse
Season 2 • Episode 1
Experts investigate the top-secret construction of a massive nuclear bunker in West Virginia.
Friday, July 18
Murder Raid Tunnels
Season 2 • Episode 3
WWII bomb shelter that became a permanent refuge for many civilians after a devastating attack.
Friday, July 18
Grand Canyon's Lost Treasure
Season 2 • Episode 2
Descending more than 200 feet beneath Arizona lies the largest dry cave system in North America.
Friday, July 18
World's Biggest Labyrinth
Season 1 • Episode 6
New discoveries about a cave system reveal secrets of Nazi occupation and Cold War subterfuge.
Friday, July 18
Cave of the Body Snatchers
Season 1 • Episode 5
Experts excavate an eerie system of underground vaults in Scotland for thieves who stole corpses.
Friday, July 18
Secrets of the Terror Tunnels
Season 1 • Episode 3
A system of tunnels built almost 3,000 years ago was the site of the greatest battles of antiquity.
Saturday, July 19
Cave of the Body Snatchers
Season 1 • Episode 5
Experts excavate an eerie system of underground vaults in Scotland for thieves who stole corpses.
Saturday, July 19
Secrets of the Terror Tunnels
Season 1 • Episode 3
A system of tunnels built almost 3,000 years ago was the site of the greatest battles of antiquity.
Friday, August 1
Cincinnati's Secret Caverns
Season 2 • Episode 2
Deep beneath the streets of Cincinnati lies a network of deserted tunnels and caverns.
Friday, August 1
Hotel Bunker of the Apocalypse
Season 2 • Episode 1
Experts investigate the top-secret construction of a massive nuclear bunker in West Virginia.
Friday, August 1
Grand Canyon's Lost Treasure
Season 2 • Episode 2
Descending more than 200 feet beneath Arizona lies the largest dry cave system in North America.
Friday, August 1
Murder Raid Tunnels
Season 2 • Episode 3
WWII bomb shelter that became a permanent refuge for many civilians after a devastating attack.
Friday, August 1
Secrets of the Rock
Season 1 • Episode 1
The secrets of a subterranean city built within the Rock of Gibraltar.
Friday, August 1
Curse of Cannibal Caves
Season 1 • Episode 10
Explorers investigating a cave system uncover evidence of cannibalism among its Ice Age denizens.
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