For the first fifty years, fusion reactors had required highly specialized fuels like lithium pellets, tritium microspheres, Bellington glass or Islington lead. However, the scientists continued to work diligently, and eventually attained their next goal: a reactor using full-sphere laser compression to cause fusion in a wide range of materials. But even these reactors were limited to fusing solid materials, and the final goal of devising a water or gas reactor seemed permanently out of reach. However, finally, a scientist working under Committee political oversight made the breakthroughs that resulted in the water reactor. A simplistic explanation is that he merely froze the water, thus turning it into a solid, but it is still to be revealed how water is kept frozen while being introduced into a reactor core as hot as the sun. The same scientist went on to create the first gas fuser, able to fuse hydrogen down into iron. Though these were brilliant achievements, the identity of the scientist is known only to the Committee, and Subnet rumours claim that, after he showed signs of burnout, his political director considered him too dangerous to live, so his final resting place became a community digester.

Antares Base

The airlock seemed to be taking for ever to cycle. Perhaps it was malfunctioning? No, the ready light now came on, so Var pulled down the handle and pushed open the door. She could grab Kaskan, pull him back inside. But, as she stepped outside, she realized she was already too late.

Ricard must have had the shepherd waiting right outside, and it was already retreating through a cloud of dust, hauling its prize up towards it. Kaskan wasn’t even struggling, just hung inert in tentacles straining to wring him out like a wet dishrag.

‘Build a monument . . . uh . . . something,’ he managed to say to her over com.

His voice sounded strained, and at that moment she noticed the horrible angle of his leg. So far it had not managed to penetrate his suit, but then his helmet fell away, with a great gout of vapour exploding outwards around his exposed skull.

At that point he chose to manually detonate the seismic charge.

Light flashed underneath the shepherd, and Kaskan was just gone. The blast wave picked up Var and slammed her back against the airlock. The robot’s body rose vertically, its legs blown off out to each side. Something smacked into Var’s chest and she peered down at a wormish segment of one of the shepherd’s tentacles. She batted it away and looked back up again, but no sign of either the robot or Kaskan now remained. By detonating right underneath it, the charge could have propelled the robot’s body for kilometres, while Kaskan himself would have instantly turned to slurry. Her back still against the door, Var slid down into a crouch, but then felt it moving, so stood up again and stepped away.