He set the com laser probing, and its red light glinted off folded limbs, fisted four-finger claws, sensor heads and three-section jointed bodies. One of these construction robots responded almost at once and began to unfold. The infective component within the signal began operating too, as this robot opened up a channel to its nearest neighbour, passing on Saul’s recoding instructions, and it too began to unfold.
‘Fuck,’ said Braddock – his frequent repetition of that word causing a flash of irritation inside Saul, instantly discarded.
The machine moved fast for something that would weigh in at half a tonne down on Earth, pulling itself neatly through the mesh of surrounding girders until it halted close by them. It possessed four grasping limbs extended, a pair each, from the rear two sections of its body, which it could swivel a full three-sixty degrees in order to position them. Two more limbs extended from the fore section, which both terminated in carousel tool heads. One was a multiweld kit capable of welding beams in place, spot welding and acetylene cutting. The other head bristled with a laser drill, diamond disc cutters and grinders, thread-tapping tools, a bolt winder and a riveter. The next robot to venture out lacked a welder, but in its place sported a spray head for depositing coatings piped from a varied array of tanks fixed on its back. More robots were now in motion till eight of them in all had positioned themselves nearby. Saul focused initially on the one with the sprayer.
‘Once Smith figures what we’re doing, he’ll throw everything he’s got at us,’ warned Braddock.
‘But still not enough, I hope,’ Saul replied. ‘These things are built to withstand severe impacts from any materials they handle – like the end of a bubblemetal beam travelling at up to five metres a second. Station antipersonnel weapons won’t be sufficient to damage them.’ He turned to look at Braddock for confirmation.
‘Yeah, but that ain’t all they’ve got.’
‘Agreed, but by the time Smith gets round to deploying something more effective, I intend to be down his throat.’ He did not add that, in order to do that, he would need to discover Smith’s location.
The spraying robot clambered on to the walkway and, under Saul’s instruction, moved along ahead of them, accelerating to the point where the walkway jagged left and reacquired walls before disappearing from sight.
‘Where now?’ asked Hannah.
‘We stay out here much longer, we’ll be caught,’ he explained. ‘It’s time to move in now, but as we move further in, we’ll start encountering the hard-wired cam system and reader-guns. Come on, let’s go.’
He led the way after the departing robot, while all around them came clattering and slithering as the other robots kept pace. Soon they reached a bulkhead door and a steep, rough-surfaced ramp which they descended to reach the next level. The robots followed one after another, folding their limbs so as to get through, then negotiating the ramp two abreast, and descending it neatly like a platoon of giant steel ants. After that, a short, filthy corridor led to yet another ramp, to another corridor, then some steps heading downwards, constructed for Earth gravity, which the robots handled better than the humans. Next they were entering a long, low-ceilinged and brightly lit room, into which natural sunlight was piped from the suncatchers positioned on the station outer rim. It housed several large cisterns containing water soup-thick with green algae.
Saul pointed up to the frameworks supporting the diffraction ends of the mirrored pipes leading from a suncatcher. ‘Do you see it?’
‘What?’ asked Hannah.
‘The cam.’
It was an old-fashioned design of security camera: a motorized socket made to take a disposable cam the size of a man’s thumb. Both cam and socket were now covered with a rapidly hardening layer of orange safety paint. Linking himself through to the spraybot, as it now moved beyond this same room, he found that it had sprayed over twenty-three cams located here, and was now doing the same to the smaller pin cams stationed in the corridor beyond. He had initially been surprised to discover one huge gap in the security system here, for in an effort to cut down on triggering false alarms, and thus not waste resources, it did not bother to register the station robots. All that would happen now was that some program would note that the cams were out. It might even be the case that maintenance would be alerted before Smith was, but Saul did not hold out much hope for that.
The cams in the following corridor were not visible to the human eye, but the robot – its vision capable of focusing on beam faults just a few microns across – had detected them all with ease. As a result, safety paint ran in an unbroken line along the ceiling, and in a punctuated line along each side wall. But such ease of progress could not last, of course. Just as they approached the entrance to the next hydroponics hall, Saul saw, through the lead robot’s eyes, that troops were now moving into position behind gulley tanks filled with distorted-looking potato plants and bulbous carrots sprouting from nutrient-laden sponges. He immediately instructed the spraybot to come to a halt, and to precisely locate every soldier waiting in ambush, relaying their positions back to its fellows.
‘Hostiles ahead,’ he warned the other two.
‘Security?’ Braddock asked.
‘Very definitely.’
Braddock sighed, then reached down for one of the grenades clipped on his belt. Saul put a restraining hand out. ‘No need.’
With a deeper link into the robots, he tampered with their safety protocols. Their systems had been keyed to recognize the human shape, so that they would not inadvertently injure anyone who got in their way while they were working. He now subverted that protocol and inserted new instructions where there would usually occur a 90 per cent drop in work rate or complete safety shutdown. The instructions were simple: grind here, drill there, cut this piece away, spraycoat that, weld this.
‘Okay, step aside,’ he said. ‘Up against the wall.’
Saul stepped back himself, and Hannah moved quickly up beside him. Braddock stood doubtfully staring at the robots, then hastily moved out of the way too, as they shifted smoothly into motion. They flowed towards the bulkhead door, which thumped up on its seals and swung open – already cued to allow through maintenance robots, like the sprayer robot that had gone through earlier. Saul gazed through their sensors, eight views opening up in the virtuality inside his mind. They were fast but then, while engaged in their usual jobs, they were as fast as any automated lathe or milling machine, or the kind of factory robots that assembled ground cars. Using simple location programs that he had no need to load, they followed the most direct routes to their targets, which had been efficiently prioritized.
Three of the robots sped up into the ceiling frames that supported diffractors, pipes and power ducts directly above the hydroponics gulleys; two went straight across the gulleys themselves, while the remaining three headed down the central aisle, turning into side aisles directly leading to their targets. Saul moved up closer to the door, to
