Pompeii

Conticinium

    [04:21 hours]

'A strong correlation has been found between the magnitude of eruptions and the length of the preceding interval of repose. Almost all very large, historic eruptions have come from volcanoes that have been dormant for centuries.'
Jacques-Marie Bardintzeff, Alexander R. McBirney,
Volcanology (second edition)

    They left the aqueduct two hours before dawn, climbing by moonlight into the hills overlooking the port – six men in single file, the engineer leading. He had turfed them out of their beds himself – all stiff limbs and sullen, bleary faces – and now he could hear them complaining about him behind his back, their voices carrying louder than they realised in the warm, still air.
    'A fool's errand,' somebody muttered.
    'Boys should stick to their books,' said another.
    He lengthened his stride.
    Let them prattle, he thought.
    Already he could feel the heat of the morning beginning to build, the promise of another day without rain. He was younger than most of his work gang, and shorter than any of them: a compact, muscled figure with cropped brown hair. The shafts of the tools he carried slung across his shoulder – a heavy, bronze-headed axe and a wooden shovel – chafed against his sunburnt neck. Still, he forced himself to stretch his bare legs as far as they would reach, mounting swiftly from foothold to foothold, and only when he was high above Misenum, at a place where the track forked, did he set down his burdens and wait for the others to catch up.
    He wiped the sweat from his eyes on the sleeve of his tunic. Such shimmering, feverish heavens they had here in the south! Even this close to daybreak, a great hemisphere of stars swept down to the horizon. He could see the horns of Taurus, and the belt and sword of the Hunter; there was Saturn, and also the Bear, and the constellation they called the Vintager, which always rose for Caesar on the twenty-second day of August, following the Festival of Vinalia, and signalled that it was time to harvest the wine. Tomorrow night the moon would be full. He raised his hand to the sky, his blunt-tipped fingers black and sharp against the glittering constellations – spread them, clenched them, spread them again – and for a moment it seemed to him that he was the shadow, the nothing; the light was the substance.
    From down in the harbour came the splash of oars as the night watch rowed between the moored triremes. The yellow lanterns of a couple of fishing boats winked across the bay. A dog barked and another answered. And then the voices of the labourers slowly climbing the path beneath him: the harsh local accent of Corax the overseer – 'Look, our new aquarius is waving at the stars!' – and the slaves and the free men, equals for once in their resentment if nothing else, panting for breath and sniggering.
    The engineer dropped his hand. 'At least,' he said, 'with such a sky, we have no need of torches.' Suddenly he was vigorous again, stooping to collect his tools, hoisting them back on to his shoulder. 'We must keep moving.' He frowned into the darkness. One path would take them westwards, skirting the edge of the naval base. The other led north, towards the seaside resort of Baiae. 'I think this is where we turn.'
    'He thinks,' sneered Corax.
    The engineer had decided the previous day that the best way to treat the overseer was to ignore him. Without a word he put his back to the sea and the stars, and began ascending the black mass of the hillside. What was leadership, after all, but the blind choice of one route over another and the confident pretence that the decision was based on reason?
    The path here was steeper. He had to scramble up it sideways, sometimes using his free hand to pull himself along, his feet skidding, sending showers of loose stones rattling away in the darkness. People stared at these brown hills, scorched by summer brushfires, and thought they were as dry as deserts, but the engineer knew differently. Even so, he felt his earlier assurance beginning to weaken, and he tried to remember how the path had appeared in the glare of yesterday afternoon, when he had first reconnoitred it. The twisting track, barely wide enough for a mule. The swathes of scorched grass. And then, at a place where the ground levelled out, flecks of pale green in the blackness – signs of life that turned out to be shoots of ivy reaching towards a boulder.
    After going halfway up an incline and then coming down again, he