In 1873, American writer and explorer Thomas Wallace Knox published Underground: Or, Life Below the Surface. Weighing in at a hefty 953 pages and drawing on the author’s own personal experience as well as ‘numerous books of travel’, ‘literary gentlemen’, and fictional and scientific sources, it offered an apparently exhaustive examination of every underground space at that point known to mankind: mines, riverbeds, vaults, caves, and many more.[1] Indeed, its subtitle was almost as long as the winding, subterranean labyrinths
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