2 adverbs to describe how to caverned

And immediately I knew that the humps did be some utter monsters, mayhaps even the great Slugs, a-slumber about the fire-pit that did burn in that strange deeply cavern.

It is a good thing, therefore, to make short excursions now and then to the bottom of the sea among dulse and coral, or up among the clouds on mountain-tops, or in balloons, or even to creep like worms into dark holes and caverns underground, not only to learn something of what is going on in those out-of-the-way places, but to see better what the sun sees on our return to common every-day beauty.

2 adverbs to describe how to  caverned  - Adverbs for  caverned