Wednesday, 15:40

Underground Worlds

In this episode, we travel to a deep abandoned tin mine beneath the moors of Cornwall in the UK. The new owners want to begin production again, searching for untapped reserves of lithium. Plus, we visit former Atlas missile silos in a remote part of Kansas, where one has been turned into a state-of-the-art survival bunker. And we venture into the network of tunnels hiding under Valetta, the capital city of the island of Malta in the Mediterranean Sea.