'Looks like the probe dislodged something,' said Gant.

'Some sort of grating - a barrier?' Cormac wondered.

'The probe would have halted at it,' Cam said. 'Anyway, no sign of any fixings.'

Cormac studied the gouges. They were almost like claw marks and he did not like the image this conjured up. It seemed that whatever had been dislodged had scrabbled frantically to maintain its position. It had failed, but left marks all round the shaft, which gave an indication of its size. Cormac began to have serious misgivings.

'Stay sharp,' he said, and noticed men that Cento and Gant had already drawn their weapons.

When they were still a half kilometre from the chamber, Cormac suddenly felt a strange beating under his breastbone. This rhydim increased in frequency till, with a thrill dirough his entire body, it exceeded the range where he could feel it. A darkness then occluded the lights below and mere came a sound as of a ton of scrap iron being rolled across the ice and stone. A shape filled the shaft and started to draw closer. It looked like a cross between a trapdoor spider and a tick, but made of polished chrome. It was huge, a nightmare, and it was coming fast.

'Jesus!' yelled Gant.

'Hit it!' yelled Cormac. It seemed more than likely that it was not coming to welcome them.

Candent flashes filled the tunnel. Stone was blasted in molten droplets from the wall. Cormac saw one chrome leg drop away, then - as a growing cloud of CO₂ vapour filled the shaft - the creature was on Gant and Cento.

'Pull back!'

The line Cam was attached to, which led to Cento, whipped to one side and Cam fell against the wall of the shaft. In the vapour there were more flashes and a sound like a compressor starting up.

'They're bouncing off! Jesus! Cento!' came Gant's yell. He came backwards out of the cloud, firing as he came, stripped-off filament cladding falling round his feet. Then came the creature, scrabbling for a grip on the walls of the shaft. Many of its legs were now missing and there were scores along its teardrop body, but it had legs still to spare and did not seem to notice the damage. Its triclaw mandibles opened and snapped shut around Gant, even while he was firing into its moudi. He yelled and swore.

Cormac drew his shuriken. He sensed Aiden and Thorn at his back, and knew they were aiming their weapons. But there was no clear shot, and the creature dropped back down the shaft, holding on to the yelling Gant, his abseil-winder making a horrible penetrating shriek as the chain-cotton was wound out too fast. Cormac slapped his shuriken back into its holster.

'Come on,' he said.

They moved on down the shaft to where Cento lay against the wall. His fingers were driven into the rock of the wall, their fleshy covering stripped back from the metal underneath. His head and one arm had been ripped away, and symhetic flesh had been peeled from him to expose his gleaming metal interior. He was completely still. Cormac turned to Aiden.

'Are you getting anything?'

'His safe-storage is secure,' said Aiden.

'OK, take his place on the line and secure him here. We have to get after Gant.' He turned to Cam. 'You wait here till we call you. If we don't, get the hell out of here.'

Cormac and Thorn went ahead into the settling CO₂ vapour. Gant was still yelling, which must be a good sign. They jogged down the shaft, pulling against the friction setting as fast as they could. Meanwhile, Cormac punched in a particular attack program through the holster of his shuriken. It hummed contentedly as it drew full charge from the holster's power supply.

'We have to get it to release Gant,' Cormac said over his shoulder to the grim-faced Thorn. 'Once it's done that, shuriken might be able to handle it.'

'Gant said our weapons were bouncing off it,' said Thorn.

'Your light weapons… they bounced off the main body… but they damaged its legs and feelers…'

Just at that moment Gant's yelling abruptly ceased, and his line went slack ahead of them. A cloud of C vapour gusted up the shaft. Cormac knew what that meant; Gant's cqldsuit had been breached. It was probably his blood that was turning the carbon-dioxide ice to vapour. He guessed that Thorn probably knew this as well. Cormac continued on, carefully, as the line ahead of him was now only partially clad.

Soon mey reached the area where the lights had been destroyed. Thorn shot two potassium flares past Cormac and the chamber below ttiem was lit up with garish purple light.

'It has no eyes,' stated Thorn. 'It uses sonar. You felt it?'

Cormac nodded agreement. He had felt it all right. 'It destroyed the lights while they were moving. It was probably put here to destroy anything that moves.' He glanced back to see Aiden coming up behind them fast.

In the glare from the flares they could see a gleaming arc of something. It seemed too large to be the creature's torso. There was movement; a play of shadows. One of the flares went out. Thorn shot two more flares in as the three of mem detached from their lines and dropped ttirough the entrance. They landed on a curved metallic surface. It was frictionless and mey slid to the floor. The creature charged, slipping on what remained of Gant. Thorn and Aiden began firing immediately, ttieir weapons on full power. Cormac tfirew his shuriken, its chainglass blades out to their fullest extent. The creature slammed to a halt in a wall of fire, then the shuriken struck. There was a whining scream and a flare of sparks. A piece of the creature's body fell away, the shuriken bounced off, hovered, struck again. A clump of legs shattered, and the creature fell to one side. The shuriken struck again, then again. CO₂ vapour filled the chamber. Thorn and Aiden were firing blind. Cormac could hear the creature scrabbling to get away and the repetitive scream of each of the shuriken's strikes. The scrabbling soon ceased. Thorn and Aiden put up their weapons.

'Dead?' wondered Thorn.

'If it was ever alive,' said Cormac.

His shuriken continued to strike until he hit the recall. It came out of the fog, retracting its blades and shrugging away pieces of something green and frozen, like shards of emerald. Cormac held up his arm as if to a falcon, and it snicked itself away in its holster. About them the fog refroze and snowed from the air.

The creature lay in pieces in a frozen green pool. Ignoring it, Thorn walked forwards amongst Gant. The soldier had been ripped to pieces. Cormac shook his head and stared down at a hand frozen to the floor before him.

'A Tenkian,' said Aiden at Cormac's side.

'Yeah,' said Cormac, watching Thorn. Thorn had found Gam's head and pulled it from the floor with a disc of frozen blood attached to it.

'I don't hold out much hope for his recovery,' Thorn said.

The joke was macabre in the extreme. Thorn wandered off to the side of the chamber, still holding his comrade's head.

'He will be all right,' said Aiden on the comunit's personal mode. 'Thorn knows the risks and is most philosophical about death. He will toast Gant on Hubris, then drink himself into a stupor. Then he will carry on. Gant would have done the same.'

Cormac inspected the Golem Thirty and wondered if it had any actual feeling of sympathy, or was just good at emulating it. It was a question that had bothered humankind for a couple of centuries now.

'Cam, you can come down now,' he said, and then walked past the dismembered guardian towards the artefact they had come to see.

It rested on the floor of the chamber like a gigantic droplet of mercury. In the light of the flares it glinted as if covered with frost. A closer inspection showed there was no frost on its surface. Cormac pushed his hand against it, and his hand slid to one side. It was friction-less, yet on inspection its surface revealed a fine crystalline structure and seemed it should have some roughness.