Part 83: Chapter 83I suppose I should have expected that.
You're in a large room carved out of sedimentary rock. The floor and walls are littered with bits of shells imbedded in the stone. A shallow passage proceeds downward, and a somewhat steeper one leads up. A low hands and knees passage enters from the south.
There is an enormous clam here with its shell tightly closed.
A giant bivalve of some kind.
Well, that's new.