Inside the tower it was pitch black, but they did not need lights. Their other senses showed them the worn metal treads of the steps quite clearly. In the upper chamber the indicator panels were dark and dead. Hyrst shivered inside his suit. He had been here so many times before, so long ago.

"Let's get busy," Shearing said.

They pulled on the rayproofs they had brought with them from the raft. Without power the lift was useless, but the skeleton cage, stripped of all its tools, was not too heavy for two strong men to swing clear of the shaft top. They made sure it would stay clear, and then sent down a light collapsible ladder. Hyrst slid down first into the smooth, round, totally unlighted hole, that had one segment of it open paralleling the machinery of the hoist.

"Take it carefully," Shearing said, and slid after him.

Clumsy in vac-suit and rayproof, Hyrst descended the ladder with agonizing slowness. Every impulse cried out for haste, but he knew if he hurried he would wind up at the bottom of the shaft as dead as MacDonald. The banging and knocking of their passage against the metal wall made a somber, hollow booming in that enclosed space, and it seemed to Hyrst that the silent belts and cables of the hoist hummed a little in sympathy. It was probably only the blood humming in his own ears.

"See anything yet?"

"No."

The vast strange glowing of the bin grew brighter as they approached it. The hoist was still "hot," and it glowed too, but nothing like the concentration in the bin.

"Even with rayproofs, we can't stay close to that too long."

"I don't think we'll have to. MacDonald was only human, and the bin was full then. He couldn't have stayed long either."

"See anything yet?"

"Nothing but fog. When you hit bottom, better use your light."

At long last Hyrst felt the bottom of the shaft under his boots. He stood aside from the ladder and switched on his belt lamp. In this case the physical eyes were better than the mental, being insensitive to radiation. Instantly the gears and cams of the feeder assembly sprang into sharp relief on the open side of the shaft. Shearing stumbled down 

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