Sweden

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Underground Worlds
2nd October 2019 45 mins Season 1 Episode 2

Explores how Sweden has gone to extraordinary lengths to protect itself - by excavating 65,000 nuclear bunkers. Plus, Somerset's Cheddar Gorge and an underground first in Romania.

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Season 1 · Episode 3

Switzerland

A look at some of Switzerland's 300,000 subterranean bunkers, the creation of a local entrepreneur shrouded in mystery in England and a network of tunnels deep beneath Slovenia.
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01 Chris Jarman profile Chris Jarmanas Self - Narrator
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