it had been like this:
A spidery web of scaffolding had been built halfway up the curving wall at its perimeter, supporting a platform of timber flooring which surrounded the glaring Gate or portal floating on thin air at the cavern's centre. The effect had been to make the sphere look like the planet Saturn, with a ring-system composed of the encircling timber floor. The cavern was a little more than forty metres in diameter, and the central sphere a little less than quarter of that. There had been a gap of a few inches between the innermost timbers and the event horizon which was the sphere's 'skin'.
Backed up against the black, wormhole-riddled wall at the perimeter of the cavern, where the supporting scaffolding and stanchions were most firmly seated, three evenly-spaced, twin-mounted Katushev cannons had pointed their ugly muzzles almost point-blank at the blinding centre, ready at a moment's notice to discharge hot, sleeting steel at anything which might emerge from the glare. Closer to the centre, an electrified fence with a gate had been an additional precaution.
But precautions against what?
The answer to that was simple: against what appeared to be the denizens of hell.
As to what the Perchorsk Projekt had been originally, and how it mutated into what it was now:
When the USA started work on its SDI programme, the USSR thought to answer with Perchorsk. If America's aim was to knock out ninety per cent of incoming Russian missiles, then the Reds must discover a way to terminate - or otherwise render ineffective - one hundred per cent of missiles originating in the USA. The answer was to have been a screen of energy (several, in fact) which would enclose the Soviet heartland or large, vital parts of it under an impenetrable umbrella.
A team of top-rank scientists was quickly assembled, and in the depths of the Perchorsk ravine an amazing subterranean complex was blasted and hewn out of the mountain itself. A dam was constructed in the ravine; its turbines would supply sufficient hydroelectric power to drive the complex and supplement the energy of its atomic pile. Working furiously, the Soviet task-force completed the Perchorsk Projekt in short order and with nothing to spare in what had been a very tight schedule. Except that perhaps the schedule had been just a little too tight.
And then the device had been tested.
It was tested just once, and went disastrously wrong... mechanical failure... energies which should have fanned out and been dispersed across a great arc of sky were turned back in their tracks, deflected downwards into the core of the Projekt. Into the pile. And the Perchorsk Projekt ate its own heart!
It ate flesh and blood and bone, plastic and rock and steel, nuclear fuel and the atomic pile itself. For a second - maybe two seconds, three - it was ultimately voracious, so much so that finally it ate itself. And when it was over the shining sphere Gate hung in thin air where the pile had been, and the laboratories and levels all around had been reduced to so much magmass.
That was what Direktor Luchov had termed those monstrous regions in the vicinity of the central cavity and Gate, 'the magmass levels': made monstrous by what had occurred in them at the time of the blowback, when flesh and rock and whatever else had been gathered together and fused or moulded into this or that incredible, unthinkable shape like so much plasticine. Men, reversed so that their innards hung outwards, had become one with the rock walls. And closer to the centre, where they had been incinerated by the heat of the blowback, there they'd left their twisted, alien impressions scorched into the blackened rock. Pompeii, in a fashion, is similar to look upon; but there in the ashes and the lava, at least the figures are still recognizably human.
After that, it had soon become apparent just what the sphere was: the fact that the failed experiment had blown a hole through the wall of this universe into another, which lay parallel. And the sphere was the doorway, the portal... the Gate. But it was a weird kind of gate; anything going through it couldn't come back; likewise for anything that came through from the other side, from the parallel world of Sunside and Starside. And the trouble with Starside, of course, was that it was the source of vampirism, the 'home' of the Wamphyri.
Things had come through from the other side, which by the grace of God