She had seen forges, ironworks, manufactories in her own world; the biggest seemed like a village smithy beside this. Hammers the size of houses were lifted in a moment to the distant ceiling and then hurled downward to flatten balks of iron the size of tree trunks, pounding them flat in a fraction of a second with a blow that made the very mountain tremble; from a vent in the rocky wall, a river of sulphurous molten metal flowed until it was cut off by an adamant gate, and the brilliant seething flood rushed through channels and sluices and over weirs into row upon row of molds, to settle and cool in a cloud of evil smoke; gigantic slicing machines and rollers cut and folded and pressed sheets of inch-thick iron as if it were tissue paper, and then those monstrous hammers pounded it flat again, layering metal upon metal with such force that the different layers became one tougher one, over and over again.
If Iorek Byrnison could have seen this armory, he might have admitted that these people knew something about working with metal. Mrs. Coulter could only look and wonder. It was impossible to speak and be understood, and no one tried. And now Lord Asriel was gesturing to the small group to follow him along a grated walkway suspended over an even larger vault below, where miners toiled with picks and spades to hack the bright metals from the mother rock.
They passed over the walkway and down a long rocky corridor, where stalactites hung gleaming with strange colors and where the pounding and grinding and hammering gradually faded. Mrs. Coulter could feel a cool breeze on her heated face. The crystals that gave them light were neither mounted on sconces nor enclosed in glowing pillars, but scattered loosely on the floor, and there were no flaring torches to add to the heat, so little by little the party began to feel cold again; and presently they came out, quite suddenly, into the night air.
They were at a place where part of the mountain had been hacked away, making a space as wide and open as a parade ground. Farther along they could see, dimly lit, great iron doors in the mountainside, some open and some shut; and from out of one of the mighty doorways, men were hauling something draped in a tarpaulin.
“What is that?” Mrs. Coulter said to the African king, and he replied:
“The intention craft.”
Mrs. Coulter had no idea what that could mean, and watched with intense curiosity as they prepared to take off the tarpaulin.
She stood close to King Ogunwe, as if for shelter, and said, “How does it work? What does it do?”
“We’re about to see,” said the king.
It looked like some kind of complex drilling apparatus, or the cockpit of a gyropter, or the cabin of a massive crane. It had a glass canopy over a seat with at least a dozen levers and handles banked in front of it. It stood on six legs, each jointed and sprung at a different angle to the body, so that it seemed both energetic and ungainly; and the body itself was a mass of pipe work, cylinders, pistons, coiled cables, switchgear, valves, and gauges. It was hard to tell what was structure and what was not, because it was only lit from behind, and most of it was hidden in gloom.
Lord Roke on his hawk had glided up to it directly, circling above, examining it from all sides. Lord Asriel and the angel were close in discussion with the engineers, and men were clambering down from the craft itself, one carrying a clipboard, another a length of cable.
Mrs. Coulter’s eyes gazed at the craft hungrily, memorizing every part of it, making sense of its complexity. And as she watched, Lord Asriel swung himself up into the seat, fastening a leather harness around his waist and shoulders, and setting a helmet securely on his head. His dæmon, the snow leopard, sprang up to follow him, and he turned to adjust something beside her. The engineer called up, Lord Asriel replied, and the men withdrew to the doorway.
The intention craft moved, though Mrs. Coulter was not sure how. It was almost as if it had quivered, though there it was, quite still, poised with a strange energy on those six insect legs. As she looked, it moved again, and then she saw what was happening: various parts of it were revolving, turning this way and that, scanning the dark sky overhead. Lord Asriel sat busily moving this lever, checking that dial, adjusting that control; and then suddenly the intention craft vanished.
Somehow, it had sprung into the air. It was hovering above them now, as high as a treetop, turning slowly to the left. There was no sound of an engine, no hint of how it was held against gravity. It simply hung in the air.
“Listen,” said King Ogunwe. “To the south.”
She turned her head and strained to hear. There was a wind that moaned around the edge of the mountain, and there were the deep hammer blows from the presses, which she felt through the soles of her feet, and there was the sound of voices from the lit doorway, but at some signal the voices stopped and the lights were extinguished. And in the quiet Mrs. Coulter could hear, very faintly, the chop-chop-chop of gyropter engines on the gusts of wind.
“Who are they?” she said quietly.
“Decoys,” said the king. “My pilots, flying a mission to tempt the enemy to follow. Watch.”
She widened her eyes, trying to see anything against the heavy dark with its few stars. Above them, the intention craft hung as firmly as if it were anchored and bolted there; no gust of wind had the slightest effect on it. No light came from the cockpit, so it was very difficult to see, and the figure of Lord Asriel was out of sight completely.
Then she caught the first sight of a group of lights low in the sky, at the same moment as the engine sound became loud enough to hear steadily. Six gyropters, flying fast, one of them seemingly in trouble, for smoke trailed from it, and it flew lower than the others. They were making for the mountain, but on a course to take them past it and beyond.