Underground.   Underwater.  

While Submerged Crawlway is the active location, deal each engaged enemy 1 additional shadow card at the beginning of the combat phase.

Forced: If Submerged Crawlway is the active location at the end of the quest phase, each player must search the encounter deck and discard pile for an enemy and add it to the staging area. Then, you may flip Submerged Crawlway to its Grotto side.