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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.
S1, EP10 "Secret School and Concealed Castle Cemetery"
A mysterious tunnel, colonial ruins and warrior cemeteries are exposed.
S1, EP9 "Subterranean Seoul and Railway Revealed"
Underground chambers, medieval tombs, old ruins and fossils are uncovered.
S1, EP8 "Episode 8"
Old Tombs, buried coins, and a 4,000-year-old oak log coffin are discovered.
S1, EP7 "Episode 7"
A buried ship, wartime cellars, jar burials and mass graves are excavated.
