Deputy Officer Iklix Varn (Human)

The ring ran quiet at ring's night, which was the first thing Varn learned under it: that a habitat has an hour when it is carrying only itself.

The Starwarden had sent two engineers down from the Passage oversight with a case between them, and Smith had sent the Deputy, because the watch's request had the watch's name on it and somebody from the watch should stand where it was carried out. The engineers did not explain what they were doing and Varn did not ask. The case held a reference instrument — one principle, one reading, calibrated somewhere that was not Eden — and the work was to set it on a member that was not mount three and let the six instruments on mount three be read against it instead of against each other.

They went down through a hatch on the Compact side that the habitat's residents walked past without seeing, and then down again, and the ring's floor became the ring's ceiling.

Varn had not been under the dock ring before. Nobody on the watch had needed to be; the instruments reported themselves. It was a space built to be stood in by people who were working and left by people who were not: plating, members, the long curve of the understructure going away in both directions under the working lights, and the cold of a structure that was between a habitat and the nothing on the far side of it. The new members were there. Varn knew them without being told, because they were the only clean metal in the run, cut square to the old and fitted so exactly that the eye slid off the join. Somebody had cut these to what the ring would still be doing when the cutting stopped, and had not cut one gram more, and had been proud of them, Varn thought, in the way one is proud of a thing that will never be looked at.

Mount three was the third of six. It looked like the other five.

The engineers set the reference on mount five, bolted it, let it settle, and waited for the six to file their next agreement. Ninety seconds. Varn stood on the plating with both feet and felt nothing come up through them, and understood, standing there, exactly what the crew's line had meant and exactly why nobody in the air had been able to hear it. The structure was telling the truth to anyone who could read it. Varn could not. That was not a failing. It was the whole reason the reference was in the case.

The six agreed with each other, on schedule, and said normal.

The reference said something else.

It was not dramatic. Nothing under a dock ring is. The senior engineer read a figure off the reference and a figure off the six, and did the subtraction on a slate without comment, and showed the slate to the junior, who looked at mount three for a while and then wrote the figure a second time in a different column, which Varn later learned was the engineers' way of agreeing. Then the senior turned the slate so the Deputy could read it, because the watch's name was on the request.

The six had been zeroed on the certification date. On the certification date, mount three had already been deflected under a load the certification did not name, and the zero had been set with the deflection in it, so that the deflection had become the floor. Everything since had been read from the floor. Against a reference that had never stood on mount three, the floor was a third of the certified load again, carried by the member the instruments hung from, since before the crew had cut a single member, since a berth strike in 2825 that a schedule had folded into itself.

The six had not been lying. They had been agreeing with the thing they hung from, which is what an instrument does when nobody asks it against anything else.

Varn looked at mount three. It still looked like the other five. The senior engineer began packing the case.

"Does it say how long?" Varn asked, and heard the question the way Smith would hear it, and already knew.

"It says how much," the engineer said. "That is all a number ever says."