Out in the lobby, they crossed the bloodstained floor. Braddock had been keeping himself busy by dragging the corpses into a storeroom off to one side. Later they would go the way of all corpses here: fed through the digesters that also processed all the sewage and other organic waste, the water drawn off and recycled, the residual compost spread below the twisted trees of the Arboretum. During the planning stages of this project, the idea had been that all materials imported up here must be recycled. Even the ash from the smelting plants was turned into a conglomerate building material. However, this hadn’t been entirely successful and, like a body ridding itself of accumulated toxins, some materials ended up ejected into space within the first year. Later, as demand for foamed metals increased, and ore was even shipped up from Earth, more and more waste was thus ejected, creating meteorite streaks across Earth’s skies.

‘So you want me to take this role,’ said Braddock.

‘Certainly,’ Saul replied. ‘I leave it all to your judgement.’ He eyed the soldier keenly. ‘I’ll also be watching them through the readerguns and robots.’ Some of those robots were now armed with weapons that Langstrom’s troops had earlier abandoned.

They headed for the main cageway running down through Tech Central, then after closing up their suit helmets, passed through an airlock into the same tubeway in which he had fought Smith earlier. They soon passed the two wrecked robots, and the sight of blood spatters decorating the walls, which started the hard lump of Saul’s knife wound throbbing in painful recall.

Eventually the tubeway extended beyond its wall panels to give an unhindered view out into the open structure beside Arcoplex One. Saul glanced aside to confirm the presence of the robots he’d summoned, then picked up his pace, propelling himself forward in a gliding, almost skating stride calculated not to raise his feet too high off the floor. He could have instead just flung himself forward until he encountered something solid, but leaving himself no way to quickly change direction, should there be hostiles nearby, did not seem like a good idea.

The tubeway ended at a junction already completed, a fattened cylindrical chamber with track-switching gear set in the floor. The worm of a stationary train blocked the branch they wanted, but they entered a pullway running alongside it. After exiting at the other end, a few more minutes of travel brought them into unfinished tubeway again. Now the robots were moving along the lattice walls immediately above and below them, like wrought-iron apes. After a further ten minutes of such progress, human figures started becoming visible waiting beside the entrance into the cell complex.