Slowing metabolism for a few hours is not too big a deal, but the adaptations to survive stomach acids maybe is? Frogs eat all manners of arthropods whole, without macerating, so whatever's down there is pretty aggressive.
I wouldn't expect a "dank basement" to require SCUBA gear. I agree with GP that this word use struck me as odd and distracting. Not sure what I expected to read about a beetle navigating an intestinal tract, but still.
It can't be "dank" if it's entirely liquid filled, come on.