Cave divers don’t get more passionate or curious than DIVER’s newest subterranean columnist… By Natalie Gibb Most people have never considered diving underground into a flooded cave. It’s not an activity that shows up on their radar. The fact that I do this for a living makes meeting people …

A couple of hours northwest of Stockholm, Sweden offers up a dive site extraordinary for its location and blend of natural and manmade features. Known as the Tuna-Hästberg mine, it’s a vast web of water-filled passages tens of kilometres long, radiating in all directions far beneath the earth’s surface. …