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UNDERGROUND
UNDERGROUND INTEREST
The Hidden London Underground
Underground History - Disused
Stations on London's Underground
Zedekiah's Cave - King Solomon's Quarries
Wales Underground - Cymru Dan Y Ddaear
Disco Dave's Tunnel Guide
Helpful guide to digging your own protest tunnels
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