Presumably there's not much more to explore. Here's the map quadrant, roughly:
We're just north of 34. I've guessed
that the door on the west wall leads to already-mapped areas (we had mapped a door there from the other side).
Our choice is east door or west corridor, but first we must decide how to cross the sand room.
Without stepping into the room, Wiglaff borrows one of his mercenaries' spears and pokes the butt of it into the sand, pushing it out a few feet into the room to see if it provokes anything, and to confirm that there is a bottom to the sand.
[f=32]Wiglaff the Elf, F3/MU2
(M 12", AC 9, HD 4+1, hp 14/14, N) cloak of elvenkind
, battle-axe; light, colour spray
[f=47]Wilibald "Willie" Whitfoot, F1/T1
(M 12", AC 6, HD 1+2, hp 9/9, L) gambeson+helm, shield+warhammer[/f]