I'm pretty sure you can't see them anywhere outside New Zealand and maybe Australia. Like little blue, bioluminescent constellations that are dripping from the ceilings. The actual story is far less romantic so if you're really interested, google New Zealand glow worms and don't say I didn't warn you.
Anyways, what goes down, must come back up and at the end of the tour, we each had to climb up this torturous ladder that disappeared upwards through a narrow opening and made your biceps feel on fire like you were climbing straight out of hell. But once you reach the top and can rely on your better developed leg muscles and climb the rest of the way out of the cave on foot, you feel all accomplished and whatnot.
We had just enough time to eat lunch at the cave tours headquarters (which was pretty tasty, I might add) see the photos our guides took of us on the tour, then change before our next adventure. This one started out the same way with a short ride but this time we had to wear wetsuits and received strict warnings not to pee, with threats of public shaming should anyone violate this simple mandate. There was no abseiling here, just a short descent down a ladder through a really narrow hole in the ground. I mean really narrow like there was one middle-aged guy with a big potbelly that it must have taken some kind of miracle for him to squeeze through that small space.
Anyways, this tour was far more interactive, as in, you are using all of your appendages to navigate both limestone and sandstone caves and trudging through near freezing water. Pro tip here: When your boots fill up with water, and they will, don't empty them because eventually your body heat will warm up the water and keep your feet a little farther away from frost bite. At certain points, the water was deep enough in the cave where we could float along on little inner tubes and admire the glowing, blue-green constellations dangling above us. When everything fell silent, it felt like we were on another planet and I refused to walk in the back of the group because the cavernous landscape reminded me of Pitch Black and I wasn't gonna be the one that gets snatched from behind by those creepy, cross-headed aliens.