A biome named "the crab caves"

A big hole somewhere (doesnt matter where) right outside the hole a previous pioneer outpost containing a pioneer black box talking about the cave.
Entering the cave its very dark, stalactices on the roof of the cave. The floor has scattered patches of blue sticky subtance (slowing you down when you touch it) white and purple coral shaped plants around the floor and walls, purple vines hanging from the roof and some pioneer bases inside the cave. Thanks for reading! the creatures in this biome will be on another suggestion!!!!