This feels like the Ruins of Undermountain... do they provide a warning with this AP that "you'll spend years of non-stop action in endless dungeons with little to no gear" lol But seriously, I'm hoping the gear situation improves as it seems like a very low yield so far, compared to WftC and HR.
Ok since some people mentioned exploring on the way back going to go with that. @Davor yeah it is pretty crazy, luckily the next book at least for a good part of it isn't as much dungeon, but there is still a pretty big dungeon in that book, just not quite as big as this one :P
After resting, eating and preparing the group descends the two stories of the crow to get back to the last level they were exploring. Having a general idea of they layout so far they decide to go east from the main entry room and find that after a short ways it leads them back to exactlly where they left off. Heading into the room they were about to explore when they were so rudely interrupted by devils attacking they see the small empty room has two more doors. However, yesterday where both were closed the one to the east is now open.
Carefully checking the eastern room you see the walls of this chamber have been coated in dried black ichor. Rudimentary lines and smears within the layers of gunk have been added to create crude examples of simplistic art, but there doesn't appear to be any sort of meaning behind it. With nothing else of interest the group checks the south door. The salty tang of the sea fills the air of this chilly room. Wall carvings showing soldiers marching to war are encrusted with salt, and a descending stair in the center of the room is filled to nearly floor level with sea water. A thin layer of blue energy shimmers across the surface of the water in the stairwell. There is also a closed door in the eastern wall.