The mining world went dark. Somebody has to go down.
ORVAL went dark. GLOAM, its mining mind, turned its drills inward and is boring a city of machines down to the planet's heart. KESTREL, pilot of the last BLASTER rig, drops from the orbital ring into the shaft.
Ten areas in five worlds: the station ring, the drop shafts of the mine, the floodworks with their acid and rising water, the spore garden, and the core. Every area has six secrets, three miners asleep in stasis pods, and a clock. Twice you climb instead of fall: once ahead of rising water, once ahead of a collapse.