…you can hear it for miles
The Doclopedia #3,248
Exploring The Dungeon:The Half Finished Room
Regardless of which tunnel/corridor you choose to go down, the doors at the end lead to a 40X40X15 foot room that looks only about half finished. The unfinished parts are still rough rock. There is not much in this room, but if you search around, you can find some useful items. Nothing too badass or worth much, but stuff that could be useful.
At the northern end of the room is a large wooden door. It is not trapped, but at the GMs discretion, it could be locked.