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![S1, EP1 "Great Britain"](https://gn-imgx.fubo.tv/assets/p21300767_e_h8_aa.jpg?ch=width&auto=format%2Ccompress&fit=clamp&h=268&w=476)
S1, EP1 "Great Britain"
The team examines the deepest shaft discovered in the UK: Titan; they hope a 3D scan can reveal its true size and secrets about its formation.
![S1, EP2 "Gibraltar"](https://gn-imgx.fubo.tv/assets/p21300810_e_h8_aa.jpg?ch=width&auto=format%2Ccompress&fit=clamp&h=268&w=476)
S1, EP2 "Gibraltar"
The team learns more about the Rock's caves and tunnels; at Gorham's Cave, secrets are revealed about Neanderthal cousins and their importance to the Ancient Greeks.
![S1, EP5 "China"](https://gn-imgx.fubo.tv/assets/p21300978_e_h10_ab.jpg?ch=width&auto=format%2Ccompress&fit=clamp&h=268&w=476)
S1, EP5 "China"
Uncovering the secrets of China's giant caves; a team maps Cloud Ladder Hall, showing how its size creates an underground weather system.
![S1, EP4 "Belize"](https://gn-imgx.fubo.tv/assets/p21300909_e_h10_aa.jpg?ch=width&auto=format%2Ccompress&fit=clamp&h=268&w=476)
S1, EP4 "Belize"
The team discovers why the Maya Civilization vanished; Professor Holley Moyes reveals how a drought caused the Maya to venture underground to make human sacrifices as they prayed for rains.
![S1, EP3 "Slovenia"](https://gn-imgx.fubo.tv/assets/p21300820_e_h10_aa.jpg?ch=width&auto=format%2Ccompress&fit=clamp&h=268&w=476)
S1, EP3 "Slovenia"
An adventure into Slovenia's largest ice cave; the team scans the volume of ice, providing data for scientists to assess climate change.
![S1, EP2 "Gibraltar"](https://gn-imgx.fubo.tv/assets/p21300810_e_h8_aa.jpg?ch=width&auto=format%2Ccompress&fit=clamp&h=268&w=476)
S1, EP2 "Gibraltar"
The team learns more about the Rock's caves and tunnels; at Gorham's Cave, secrets are revealed about Neanderthal cousins and their importance to the Ancient Greeks.