From ice caves to secret underground military bunkers, watch as we take you through the most wondrous and incredible underground marvels of Season 1!
The Great Altar – 00:00 – 07:30
Pionen Data Center – 07:30 – 15:24
Black Hole Trail – 15:24 – 22:57
Kingdom of Salt – 22:57 – 32:00
Caves of France – 32:00 – 38:04
Ice Caves – 38:04 – 45:53
Jersey War Tunnels – 45:53 – 52:34
Theodosius Cistern – 52:34 – 1:02:10
