Hetwhistle's torch fizzles out. Serech, Rhod, Golguldir, Altman and Archie are in the sawdust room with light. The bodies of Hetwhistle, Gunther, Oldtin and Blas lie in the dark of the checkerboard room (and beyond). I will assume Lawrence follows Serech and is also in the sawdust room.
So, there are four survivors, plus two mercs, in the sawdust room.