The dash along after the halfling brought Maria to almost pass a widening in the corridor, but by instinct the monk noticed something. The widening also showed another corridor's opening, with a stone 'wall' sliding in place to cover it. Without seeing the door closing, it would have been hard to see the seam. As it closed, however, Maria was left without any indication of what opened it.<br/><br/>The rumbling behind came closer and closer, and then stopped with a slamming sound. The slam coming somewhere near,<em>behind</em>a wall it sounded. There was no sign of any stone in the hallway they had been coming down in, but in the dark hallway the shake had been plenty of a scare.<br/><br/>The tunnel going ahead ended up with a staircase, circling down somewhere further below. Below with light shining down there.