Folder: Underworld Page 1 of 2

Workers, Guards and Management Staff of the Borralha Wolfram Mines, Montalegre, Portugal, 1918.

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Hawthorn ridge mine explosion, July 1st 1916

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Félix Nadar, Catacombes de Paris, 1861

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Félix Nadar, Égouts de Paris, 1861

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Construction of the Subway Tunnel under 6th Ave., New York, 1939. Photo: Bob Seelig/New York Daily News

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The Beach Pneumatic Subway Tunnel under Broadway, 1873. New-York Historical Society # 70265 In 1869, folowing the use of pneumatic tubes for postal communication, Alfred Ely Beach started…

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Construção da Barragem de Picote, no Douro Um dos seus vários túneis (1956?)

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Entrance to cave. Vavau. Postcard,  unknown source.  

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Etna Athanasius Kircher, Mundus subterraneus (1664)

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Vesuvius Athanasius Kircher, Mundus subterraneus (1664)