1. Great Britain
Avsnitt 1 - Great Britain, Säsong 1
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.
2. Gibraltar
Avsnitt 2 - Gibraltar, Säsong 1
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.
3. Slovenia
Avsnitt 3 - Slovenia, Säsong 1
An adventure into Slovenia's largest ice cave; the team scans the volume of ice, providing data for scientists to assess climate change.
4. Belize
Avsnitt 4 - Belize, Säsong 1
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.
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