Lukas does a little snooping through the halls, up to going south to the top of the stairs.
He sees the following:
Two eastern passages end in dead ends from cave ins back in ancient days.
There is a closed door leading east and a closed door leading south along the side of two of the halls.
At the bottom of the stairs, a corridor runs east and west.
Shae sees nothing along the far side of the chasm except for a solid wall going up and down as far as she can see. Infravision does nothing to expand her vision.
Shae pulls up the rope. The end of the rope is sheared off smoothly, as though cut with a blade. But the rope itself is ancient, has been here for many years, and barely holds together even at the touch. It would not hold any weight.