Pirx worked his way down, knelt, and peered into the observation well. The periscope mirrors were discolored with age. Too much radiation exposure, he thought. So what? This was a trip to Mars, not Jupiter—with a ten-day turnaround. Fuel supply okay, enough for several runs. He activated the cadmium rods. The needle quivered and grudgingly shifted to the other end of the scale. He checked the delay: it was close enough to squeak by the SSA, but just barely.

Something stirred in the corner. A pair of luminous green dots. He kept an eye on them, flinching as they slowly slinked away. He closed in on it. It was a cat. A black and bony cat. Meowing softly, it rubbed its spine against his shin. Pirx smiled, canvassed the room until his eye landed on something high up on a metal shelf: a row of cages. Now and then something white flickered inside, a glittering black bead would show through the netting. Mice. They were still in use on some of the older ships—as live radiation gauges. He stooped down to stroke the cat, but it slipped away from him, stopped dead in its tracks, and turned in the direction of the room’s darkest, narrowest corner. Arching its back, meowing softly, it crept on outstretched paws toward a concrete buttress, beyond which the mouth of a passage gaped rectangularly. Wiggling the end of its tail, now stiffly perpendicular, it advanced slowly, so black as to be almost indistinguishable in the dark. Pirx, intrigued, crouched down for a better look. A small door, halfway open, was set in a sloping wall; something glinted inside, which at first he took to be a coil of metal hose. The cat stood transfixed and immobile, its hair on end, its stiffened tail describing little curls in the air.

“Aw hell, there’s nothing in there,” he grumbled, at the same time squatting down for a closer view inside the dark compartment. Someone was sitting inside, the upper half of its body giving off a dull, metallic sheen. The cat, meowing all the while, started for the chute. Pirx’s eyes gradually got accustomed to the dark; soon he could make out a pair of pointed knees raised up high, and shinguards, made of a low-luster metal, around which a pair of segmented arms was wrapped. Its head was lost in the shadows.