He hesitated, hefting the ax, glancing back at the way he had come. There had to be a way out, even if it meant chopping through a wall.

When he turned around again there was a door. It was oddly shaped and unlike the door he had hewn through, but clearly a door all the same, and it was open.

McCray regarded it grimly. He went back in his memory with meticulous care. Had he not looked at, this very spot a matter of moments before? He had. And had there been an open door then? There had not. There hadn't been even a shadowy outline of the three-sided, uneven opening that stood there now.

Still, it led in the proper direction. McCray added one more inexplicable fact to his file and walked through. He was in another hall—or tunnel—rising quite steeply to the right. By his reckoning it was the proper direction. He labored up it, sweating under the weight of the suit, and found another open door, this one round, and behind it—

Yes, there was the woman whose voice he had heard.

It was a woman, all right. The voice had been so strained that he hadn't been positive. Even now, short black hair might not have proved it, and she was lying face down but the waist and hips were a woman's, even though she wore a bulky, quilted suit of coveralls.

He knelt beside her and gently turned her face.

She was unconscious. Broad, dark face, with no make-up; she was apparently in her late thirties. She appeared to be Chinese.

She breathed, a little raggedly but without visible discomfort; her face was relaxed as though she were sleeping. She did not rouse as he moved her.

He realized she was breathing the air of the room they were in.

His instant first thought was that she was in danger of asphyxiation; he started to leap up to get, and put her into, the small, flimsy space suit he saw slumped in a corner. At second thought he realized that she would not be breathing so comfortably if the air were full of the poisonous reek that had driven him out of the first room.

There was an obvious conclusion to be drawn from that; perhaps he could economize on his own air reserve. Tentatively he cracked the seal of his faceplate and took a cautious breath. The faint reek of halogens was still there, but it was not enough even to make his eyes water, and the temperature of the air was 

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