The tour at Soudan Underground Mine park in Minnesota reaches 2450 beneath the surface in primordial Iron Oxide deposits. The tours of the 49er Gold mines in California, the Copper mines in the upper peninsula, and the asteroid strike at Sudbury all peter out at a couple hundred feet below the surface. Is there anywhere that a non miner/neutrino specialist can get more than a couple of thousand feet into the ground ?
The deepest cave in the world was in Salzburg, Austria. It’s name is
“Lamprechtsofen-Vogelshacht” and it is 5,354 feet deep (1632 m) plumbed the awesome depths!
http://panda.bg.univ.gda.pl/~dbart/rekord_e.html
But just this year this one claims the record:
“Voronya cave” reexplored by Ukrainian - Russian team in Arabica massif in Caucasus mountains in Georgia
1700 m deep.
Woah, I’ve actually been in that cave…or at least, I’ve been in a fairly deep cave in Salzburg. It was used for salt mining, you rode in on a mining car (on a track that did NOT feel safe…passing through tunnels with about 6 inches of room to spare…in the dark…), you slid down slides and what have you, watched a film, crossed a weird underground lake…all in all, a very cool experience. We didn’t go down that deep (after all, we were just in the tourist part of the mine), but the whole impression was of a huge underground entity that one could get lost in very easily. Eerie, but cool.