Sorry, southeastward, more like
The descending passage lets out into a massive chamber with an uneven floor and walls, roughly carved out in stark contrast to the uncanny smoothness of the previous areas. This chamber is about 50' by 80', with a large pool of water on the west side, about 25' by 60'. A large wooden desk and stool are set by the east wall; a few ceramic pitchers and bowls are on the table. There is a passage leading out from the south wall.
The mud creatures are here, huddled by the edge of the pool. They stir and burble when the party enters the chamber, but hold their ground.