Galerie d’aérage
Not sure what this tunnel was, it lies underneath an old coal mine, so could have been an ventilation tunnel.
Not sure what this tunnel was, it lies underneath an old coal mine, so could have been an ventilation tunnel.
An abandoned underground slate quarry with enourmous caverns, tracks and old rusty winches
What more do I need to say? The Paris Catacombs are the underground Walhalla for most explorers. Over 300km of old tunnels …
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 …