Crystal Cavern is the 7th layer of The Overworld mine in Mining Simulator 2. This layer of the mine begins when you reach a depth of 1,837. The layer continues until the max mine depth of 10,000.
You can access another free chest in the Crystal Cavern lobby. This chest rewards some gems & respawns every ? hours. Reset it instantly for ? Robux.
There is also an egg that you can hatch in this layer called the Crystal Egg.