'Let's find a vantage point,' Khuv moved faster, heading for the stairwell through to the core. That was the only way to go now, down to the core itself. But with still thirty or so paces to go to the final descent, Litve grabbed Khuv's elbow. '

'Look!' he croaked.

Khuv looked back. From behind a leaning magmass nodule, a shadow had fallen on the walkway. One that moved. Closer still, there was more movement: Khuv's and Litve's startled eyes went together to a heavy-duty cable where it snaked along the mad flow of the magmass wall. The cable jerked; its loops between staples contracted as something hauled on it. Almost before the meaning of this could dawn, there came a cry of combined pain and frustration from behind the same magmass nodule. The shadow on the walkway was highlighted, emboldened by flaring blue illumination and a shower of sputtering sparks. And it was a monstrous shadow!

Incapable as yet of movement, the two watched. The shadow - a single shadow - began to split in two. There came a rending sound, like sailcloth tearing, as the two halves of the shadow struggled to break apart - struggled and succeeded. Two of them now: one of which seemed human, and the other the size and roughly the shape of a dog, except it was not a dog. Then both of them moving back a little, merging with the shadow of the nodule, and a further moment of struggling with the power cable. There was more electrical sputtering and a second shower of sparks...

And the lights went out!

The two men backed toward the shaft going down to the core. Their legs were jelly but they forced movement out of them. A faint wash of light came from behind them, over their shoulders: residual light from the sphere-gate, shining up through the shaft. But along the walkway where they'd been, all was now night.

'If he - it - they are going to come,' Litve stuttered, 'then it has to be along this walkway.'

Khuv's throat was too dry and tight to answer, but he thought: that's right. They were both wrong. The thing from the tank, or rather metamorphic vampire material from the core of the thing in the tank - not dead but subsumed into Agursky, and now released to even up the score, two against two - didn't have to come that way at all. It came under the walkway!

Almost at the mouth of the shaft, where the walkway turned sharply to the left and once more descended as stairs, the thing struck. Something coiled up over the handrail, wrapped itself clingingly around Litve's waist, dragged him screaming through the shattering rail. He was there, beside Khuv, and he was gone. His flamethrower put forth a single blast of flame, and looking down Khuv saw what had him. The thing from the tank, yes: a great flat tentacled leech now, which smothered Litve's face and the upper half of his body like a mass of leprous dough, while its many-jointed 'limbs' wrapped him and crushed his body like so many pythons! And eyes in the surging filth of the thing, staring up unblinking at Khuv where he choked and gurgled on the walkway.

Litve's flame-thrower went clattering; Khuv knew that was the end of him; he aimed his own weapon and sent searing flame blasting into the heaving obscenity where it threshed on the magmass floor. Screaming his rage and terror, he burned it - burned it - burned it. Until the white heart of his torch turned yellow, hissed, crackled into silence, until the pilot-light itself went out. Then came Agursky's chuckle again, and through the reek and the smoke Khuv saw him coming. He saw him closing with him, his hands elongating, reaching...

He dropped his empty weapon, ran, stumbled, went flailing down the stairwell into the heart of the place; and down the stairs from the landing onto the boards of the Saturn's-rings perimeter. Agursky came close behind, chuckling, flowing, inexorably pursuing. Khuv looked back and saw him: the impossible gape of his jaws, the nightmare of his bone dagger teeth meshing like a mincer in the cavern of his mouth. He screamed and raced for the nearest Katushev cannon.

'Shit, shit!' he screamed, and: 'Oh, God! Oh mother of - ' He leaped up onto the Katushev's platform, slid into the gunner's chair, traversed the assembly to face Agursky where he loped after him. But ... he had no idea how to fire the thing!

Before Agursky could reach him, he leaped out of his seat, fled across the rings and onto the gantry bridging the gap to the sphere. The power was off and the gate in the electrical fence open; Khuv ran through it, reached the spot where the boards were scorched and blackened. The Gate was the only route open to him now, but better that than -

He skidded to a halt, threw up his hands before him to ward off... something he couldn't believe, something from the mind of a raving lunatic! He stared at the sphere and his eyes bulged, popped in his white mask of a face. Agursky had seen it, too, and he was likewise brought up short. And a third pair of eyes had seen it, had indeed been watching it for some time.

Up in Failsafe Control, Viktor Luchov waited no longer but threw the failsafe switch. He opened the floodgates to hell - because he had to, and for Khuv. For Khuv, yes, who even now turned his face to the closed circuit TV monitor and pleaded with him, begged him to do it. 'Do it!' the Major's face screamed silently at Luchov from the centre screen. 'For God's sake, Viktor, if you know the meaning of mercy - do it!"

Volatile liquids rushed and sprinklers commenced spraying all through the Projekt; plastic pipes began to blister as the liquid flowed faster; thousands of litres of the stuff flowed into the heart of Perchorsk, becoming vapour where it was exposed to air. Forced by the weight of fuel in the huge tanker, dragged downwards by gravity, it quickly saturated the complex, began to gush from an outlet into the core itself.

The core: where now Agursky knew he was finished and closed with Khuv, reaching for him. But the Major was no longer concerned with Agursky, only with the thing that was breaking through the screen of the sphere, only with the heaving, pulsating monstrosity of hooks and teeth and claws which wore the vast, bloated, nightmare distortion of ... of Karl Vyotsky's face!

But this was not, could not be, the Vyotsky who had gone into that other world; it was so radically different that its passage through the gate in the reverse direction had not been forbidden. It half-emerged, saw and fell upon the figures on the gantry and devoured them, and in the next moment was itself devoured. Somewhere, the deadly vapours had reached a naked flame. Incendiary fires raced through the Projekt in an unstoppable chain-reaction. The entire place detonated - exploded - like a vast bomb!

Viktor Luchov, gasping and almost fainting from his exertions, was hauled through the wicket-gate onto the marshalling area in the ravine under the cold night stars. They hurried him away from the giant doors, which in a little while were blown off their rollers like so much scrap metal. A shaft of fire roared out, bending like a waterfall to strike the dammed waters, sending clouds of steam boiling upwards.

Perchorsk was no more...

From the time of his early childhood, when he was maybe eight or nine years old, Harry Keogh remembered one especially bad dream. It had been repetitive, bothering him through many long nights, and even now - especially now - was not forgotten.

Where the idea had originated, he couldn't say. It might have come from some ancient medical book, or from the mind of one of his long-dead friends, may even have stemmed from a flash of precognition. But he could still remember it in detail. The long hall, brick walls, and the heavy wooden tables set end to end; the starving man stretched out on his back, lashed to the end table; his head firmly fixed between blocks of wood, a leather strap across his forehead to keep it tilted back, and his jaws propped wide open.