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Uncovers the extraordinary worlds that exist beneath major urban centers, from the tombs and wartime shelters of Naples to the manmade Royston Cave in Hertfordshire, England.
S1, EP1 "Underground Cities and Secret Chambers"
Scientists uncover a city, a chamber, and a complex, and map a tunnel network.
S1, EP2 "Crystal Cathedrals and Buried Bunkers"
Scientists uncover salt chambers, bunkers, old kingdoms, and mysterious caves.
S1, EP3 "Hidden Hypogeum and Lost Letters"
Archaeologists find a tomb, a haunting cave, and a sophisticated labyrinth.
S1, EP4 "Tunnels and Tombs"
Explorers discover tunnel systems, a sprawling city, and military barracks.
Uncovers the extraordinary worlds that exist beneath major urban centers, from the tombs and wartime shelters of Naples to the manmade Royston Cave in Hertfordshire, England.
Original Air Date: Feb 25, 2026
Rating: TVPG
Playback: HD
1 seasons available on demand
Available on