That whole section of the article seemed pretty silly. Talking about rappelling down a rope, through a tight passage, and through twisty, turny little passages

That whole section of the article seemed pretty silly. Talking about rappelling down a rope, through a tight passage, and through twisty, turny little passages is really just another cave, in that respect. If you're claustrophobic it might put you off, but if you've done any spelunking, this is nothing at all to write home about.