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Not underground but underwater: http://www.amusingplanet.com/2016/12/witley-parks-underwater-ballroom.html http://www.visualnews.com/2014/12/09/secret-underwater-ballroom-built-notorious-victorian-swi
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Underground
Discuss specificaly tunneling and underground space.
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Interesting use of the underground for flood control: http://architectureofdoom.tumblr.com/post/158964495563/urbain-tokyo-flooding-the-defences-protecting
