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So when we get close to the edge we don't go back: we look over. It's just another way of getting rid of infantile aggression and if you don't like it you can do the other thing.

There wasn't any real problem. If I let that stuff go on drifting it'd either blow a mine or move free and wallow around in daylight tomorrow and attract attention and if either of those things happened it'd finish the mission and that wasn't the object of what I was doing here. I was here to complete Mandarin according to plan. It didn't look as if I had a chance in hell of coming out alive but that wasn't a reason for not going in at alclass="underline" it was gut-think.

Immediately around me was an area of dim light and beyond it was a soft gathering wall of dark and somewhere on the other side that stuff was drifting in the current: two steel cylinders, each of them charged at a pressure of two thousand pounds a square inch and capable of smashing through the wall of a building and flying three streets away and going through the side of a bus and that was just if the valve broke. They could do better than that if they went the wrong way through a minefield.

The one factor that had any value for me was that of time: the longer that stuff went on drifting the less chance I'd have of finding it before it hit one of those bloody things and blew the sea apart. So I thought I'd better start now.

Chapter Thirteen: DIRECTIVE

The water was grey-green, growing lighter and darker as I rose and fell, gliding through the grey-green world, going my way in silence.

Three minutes.

They drifted past me in the shifting light and shadow, their steel spheres glowing as they caught a gleam of light from above, their copper horns thrust outwards from them, naked and quiet.

Two minutes.

I threaded my way between the cables, sinuous and slow and taking care. Nothing lived here and nothing moved except this black rubber creature as it passed through the cloudy avenues of spheres, but a presence was here, of a kind so different from my own that I felt its hostility: the blind trapped presence of a thing unborn, a thing that once free would hurl the sea apart. I made my slow way through it.

One minute.

Sometimes a bubble rose from the sea bed, turning dull silver and then shimmering past my face, vanishing above me. One of them passed close to a mine not far from where I moved: it touched and broke against the tip of a copper horn and for an instant sent me mad as the firestorm roared raging through my head. Then it was over: the sound died away and the seas subsided and hollowed echoes of my breathing slowed again. The potential packed inside these deadly fingers had grown too much on my mind and I wanted nothing to touch them: not even a bubble.

Zero.

02.30.

Break-off point. I'd been searching for half an hour and hadn't seen anything and this was the time when I must break off and let the stuff go on drifting. Beyond this limit I'd start using the air that was reserved for taking me as far as Heng-kang Chou if I had to get out of the target zone and go to ground. I'd covered most of the minefield and drawn blank: in daylight I would have seen the loose gear long before this but I'd been working in near darkness and without a hope of using the lamp because the mines were cabled on outriggers below the surface, well clear of the rig's substructure, and if there were look-outs posted on deck they'd pick up the glow of the light.

Twice I'd doubled back on my tracks without knowing it until I'd seen the faint image of a pontoon leg on the wrong side, a hundred feet below, and realized I must have turned too far where the mines made a right angle. Once I'd wasted time going down to fifty feet, seeing a patch of shadow that had turned out to be a mass of drifting weed.

I turned obliquely and dived in a long curve, coming up inside the minefield and heading for the great trellis of girders, hearing the sound when I was almost halfway across the open space. It was the sound of a ship's bell, cracked and muted, its rhythm irregular. In five minutes I had the direction worked out, turning full circle to orientate aurally and then moving across the slow southerly current and through the network of girders to the far side, reaching the minefield again.

I didn't have to search far, once I'd got there. The stuff was looming in front of my faceplate, stationary except for the slight tug of the current. The nylon cord had fouled one of the cables and was wrapped around it, and the sound of the ship's bell was being set up by the valve of one of the reserve tanks as it kept hitting against the mine.

I stood off, watching it, my hands fanning gently to keep me upright. The waterproof bag containing the radio and the rations was creating resistance against the current: part of it had caught around the cable, leaving one of the tanks to swing against the mine. It wasn't any good trying to make an estimate and work on its findings because there were too many unknown factors but it didn't look as though I had long because the shoulder of the cylinder was nudging one of the detonation horns and it was a strictly shut-ended situation so I kicked with the fins and moved in, freeing the cord first and then working higher up, keeping my head back and the faceplate clear of the horns as I pulled the reserve tank clear. It wasn't easy because the mine was fixed to its cable with a turnbuckle and cotter pin and the pin kept catching against the valve-guard.

Normal thought process had ceded to a form of specialized attention: the conscious field had narrowed to contain only the essentials I needed to work with — the shape and size of the valve-guard and the cotter pin and the horn of the mine, the angles and direction in which the manipulation had to proceed, the forces against it and the means of combating them. But somewhere in my head there was panic trying to get loose, like an area of pain the anaesthetic hasn't quite reached.

Ignore.

This thing wasn't long out of the armament factory: the steel had a satin sheen and the copper of the horn was catching the glow of the flare pilot burning above the rig. The cotter pin was bright and a blob of grease still clung to the thread of the turnbuckle. There were Roman characters indented around the rim of the mine itself: they weren't clear in this light but it looked like Hitachi, Japan.

The valve-guard came free and I backed off, bringing the gear with me. The time was 02.51 and I was alive and the mission was still running.

Just after 03.15 I went aboard the rig.

The storm-wave height of the lower deck was fifty feet, leaving a gap between the deck and the surface of the sea; but in this area it was almost dark and the girders gave a network of cover. I left all four tanks and the rest of the scuba gear lashed to a girder below surface and climbed one of the iron ladders. I didn't expect to find look-outs on this first deck: they'd be surveying the open sea beyond the limits of the minefield. There was a radial series of catwalks and I took one of them as far as the central ladder that served the drilling complex, going up again and reaching the top deck.

A single main lamp burned alongside the derrick, flooding most of the deck. A blizzard of bright moths blew around it and a lone bat circled, gorging itself, sometimes rising to the height of the flare pilot flame and circling again. Most of the deck was taken up with the drilling rig, skid mounted and abutting on the control cabin. The turbines took up the rest of the space and the helicopter pad was raised on a separate platform clear of the derrick and the two auxiliary pedestal cranes.

There were more radio facilities than I'd expected: two masts cantilevered off the top deck and carrying microwave dishes, and a third mast with a booster-type unit that looked very like a tropospheric scatter system, conceivably for data transmission, rig-to-shore.