Slate Quarry
An abandoned underground slate quarry with enourmous caverns, tracks and old rusty winches
Les Catacombes de Paris
What more do I need to say? The Paris Catacombs are the underground Walhalla for most explorers. Over 300km of old tunnels …
Limestone Quarry
Here’s one we’ve been thinking of doing for a long, long time now. Under the Belgian/Dutch border lie hundreds and hundreds and …