John Ringo - When the Devil Dances

She returned to find that Nathan and Shannon had unbuckled themselves and were trying to pry open the door at the end of the corridor, but she got all three connected to the cable before too long. Finally she took Billy’s face in her hands and pointed out the opening.

“Billy, you have to stay with your back to the shaft, facing the wall,” she shouted. “You’ll have to work to stabilize yourself; otherwise Amber will be crushed against the wall. Do you understand? Face the wall.”

The boy nodded looking at her with dark eyes and then pointed at her with a questioning expression.

“I’ll follow you down; I have to work the winch.”

He nodded and closed his eyes, pointing over the side.

She patted him on the shoulder and then clipped off her own safety line and leaned out into the shaft, swinging the cable back and forth and waving to Shari far below.

Billy caught at the ropes to keep from being pulled out by the weight of the cable, but Wendy had it clamped down and he wasn’t going anywhere. Until she released the clamps.

The biggest problem in lowering the children over the lip of the opening was the weight of the cable. Each child was in a harness, either one from the maintenance closet or, in the case of Shakeela and Nathan, a “Swiss seat” made of rope. Each of these was, in turn, attached to a short length of climbing rope and this was attached to clamps on the cable itself. There were two children per clamp and they were currently occupying their remaining free time holding onto each other and, almost to a child, crying their eyes out.

But the cable would pull the children over the lip in an instant if Wendy simply let it slip. And the winch was too far forward to use to attach the children. So she had pulled a section of cable back into the corridor, attached it to a safety ring, set up the tandem rigs and attached the children. Now she faced the problem of slowly lowering them over the side.

She finally took the remains of the climbing rope, looped it through the same ring to which the cable was attached and tied it securely to the last of the children’s clamps. Then she set up a complicated but safe method of lowering the cable over the side using the friction of the rope against itself. Furthermore, she could clamp it off to stop the whole process and she could do it all from the edge.

She nodded at Billy, who was strapped in next to Kelly. The younger girl was now more or less catatonic, but when her brother pushed forward and over the edge she let out a strangled scream and grabbed onto him.

Billy managed to keep Amber from being crushed against the side and he did it all while stroking his sister to try to get her to calm down and having his eyes tightly shut.

With the weight pulling them over the side, the rest of the children were more or less forced to go. Wendy lowered them slowly, ensuring with each that nothing was stuck or pinched as they went over the side. Shakeela managed to get unbuckled again, but Wendy put her back on the line and pointed out that if she did that when she was being lowered it was a long way down.

Once the children were over the side and the rope detached, the lowering went like clockwork. She held the remote control for the winch and leaned outward, lowering them slowly. It was nearly eight hundred feet down and at first she was worried about oscillation. But Shari was on the bottom controlling the take-up and the descent was smooth. Billy lost his footing a couple of times, but each time she stopped the cable until he was set again.

When the cable reached Shari she let out just enough line that Shari could pull the pairs of children into the lower opening. It only took a few minutes and by the end of it, Wendy was shaking. She had to go down next.

How to get down was a huge question. The climbing ropes were only two hundred feet long so rappelling was out. And if there was an eight-hundred-foot rope in the Urb it would be in the security office which the Posleen had already overrun. She had come up with a way to do it, theoretically, but she really didn’t like it. It had about a thousand things that could go wrong and all of them ended up with Wendy Cummings as a red blotch on the scum-covered floor of the airshaft.

But it was the only thing she could think of doing and if she stayed there “taking counsel of her fears,” as Tommy would put it, she was going to get et .

Finally she cut several lengths off of the climbing rope and started tying knots.

The basic method for lowering was called a “Prussik knot.” She took a section of rope and the ends together. Then she wrapped it around the cable and back through itself. When she put weight on one end, the rope would clamp down on the cable and hold itself in place. Theoretically. On another rope it would work fine. On a cable things were different.

The problem, of course, was that the cable was metal. It was both lower in friction than a rope and greased. All things considered, it was not a good candidate for lowering herself using Prussik knots. The answer to that, from Wendy’s perspective, was to make several. Thus if one cut loose, the others would start to clamp down.

The last line was tied off to her safety harness and wasn’t from the climbing rope, it was one of the safety lines. If she went into freefall, the rope would snag on the cable at the bottom. There were several bad things that would happen then, starting with slamming into the side of the airshaft, but most of them were better than being a red blotch on the floor.

She tested the security of the knots at the edge and they seemed to hold, so she put her foot in one, grabbed two others and stepped over the edge.

And immediately slammed into the side. The good news was the knots were holding, the bad news was that lowering herself was not going to be an easy evolution.

Finally she got a rhythm going. She would let go with one hand and loosen and lower the two foot knots. Then she would lower the two hand knots. Using this slow method she had travelled about two hundred feet, or a quarter of the distance, when she heard a Posleen railgun down one of the side corridors. Then one appeared towards the top of the shaft, on the far side. If it looked down, she was dead meat on a string.

She had noted that by grabbing the knots where they were wrapped around the cable, she could slide them without removing her weight. Sliding the two hand knots down she managed to get all four of the knots side by side and started working them all down without taking pressure off.

What she was unaware of was that the ropes, by sliding over the two hundred feet of cable, had picked up quite a bit of grease. Combined with this, by maintaining pressure, she was significantly increasing the friction generated by the method. Increased friction meant increased heat. Increased heat reduced the coefficient of friction of the climbing rope and under the conditions gravity began to assert its natural hold.

Wendy had gotten another forty feet down when first one foot rope then the other started to slide on their own. She immediately threw her weight onto the two hand lines, but the sudden jerk as she did so changed their coefficient from standing, high, to moving, low, and they, too, began to slide.

She was now on a one-way trip to the bottom of the cable and there didn’t seem to be much she could do about it.

She clamped her hands around the upper ropes for dear life. If she clamped down very hard she could slow her progress, but already she could smell the ropes beginning to melt and fray. She worked one of the foot ropes up by bending herself into a U, but that rope was smoking as well and the bottom of the cable was coming up fast.

She managed to slow herself to what felt like a hurtling speed just as first one of the foot ropes and then the other gave way. Her glove-covered hands were now for all practical purposes the only things on the cable and she slammed onto the end of the cable at nearly twenty miles per hour.