4. The Irradiating Inferno
You're getting close to the core, but don't get too cozy. The walls are closing in, literally.
Next: 4.1 - The Sulfuric FuryA Brief History
The caverns have been irradiated by an ancient nuclear reactor, making it the hottest spot in the underground. Don't say we didn't warn you.
Be careful not to get too close to the walls, or you'll be glowing like a radioactive mushroom.
See also: 4.1 - The Sulfuric Fury Back to Crystal Caverns Index