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Berliner Unterwelten e.V.
The Hidden London Underground
Underground History - Disused Stations on London's Underground
Wales Underground - Cymru Dan Y Ddaear
Disco Dave's Tunnel Guide
Helpful guide to digging your own protest tunnels
Extinguishing Underground Fires
Account of an Earthquake
Underground water storage tanks are sometimes known as cisterns
Also see Geology and Archaeology
Underground? Also see UNDER WATER
More links required! If you know of any sites which specialise in that which is below the surface of the ground, these can be included in this page. Whenever someone has managed to dig a big hole, it needs looking into.
More URLs and contacts round the world required!
Links were last checked 2008/04/14 to make sure there were no problems with links