Scanner Sombre

Regaining consciousness you smell the damp. Opening your eyes you see the stone walls of the chamber flickering by the light of the fire; you stumble to your feet and kick a helmet clattering across the floor. Slowly the ache in your head begins to subside and you notice the beginnings of a passage. After a few steps the darkness consumes you. Returning to the safely of the fire you see a LIDAR scanner on the floor - a trigger press results in a faint glow coming from inside the helmet. You put the helmet on, adjust the beam-width and proceed into the abyss.