The episode explores the underground city in Montreal, a vast network of tunnels used for transportation and commerce, but not for residential purposes.
In this episode, we answer a question from 5-year-old Wyatt in Los Angeles and learn about ancient underground cities in Turkey, the subterranean passageways of Montreal and the dug-out houses of Coober Pedy, Australia. Also in this episode: Why is it so warm underground?
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