Ice Station Zebra. Alistair MacLean

and into the polynya – I hope.’

      ‘Me too,’ Hansen said. ‘There can’t be more than a couple of feet between the top of the sail and that damned ugly stuff.’

      ‘There isn’t much room,’ Swanson acknowledged. ‘Sanders?’

      ‘Just a moment, sir. The graph looks kinda funny – no, we’re clear.’ He couldn’t keep the excitement out of his voice. ‘Thin ice!’

      I looked at the screen. He was right. I could see the vertical edge of a wall of ice move slowly across the screen, exposing clear water above.

      ‘Gently, now, gently,’ Swanson said. ‘And keep the camera on the ice wall at the side, then straight up, turn about.’

      The pumps began to throb again. The ice wall, less than ten yards away, began to drift slowly down past us.

      ‘Eighty-five feet,’ the diving officer reported. ‘Eighty.’

      ‘No hurry,’ Swanson said. ‘We’re sheltered from that drift by now.’

      ‘Seventy-five feet.’ The pumps stopped, and water began to flood into the tanks. ‘Seventy.’ The Dolphin was almost stopped now, drifting upwards as gently as thistledown. The camera switched upwards, and we could see the top corner of the sail clearly outlined with a smooth ceiling of ice floating down to meet it. More water gurgled into the tanks, the top of the sail met the ice with a barely perceptible bump and the Dolphin came to rest.

      ‘Beautifully done,’ Swanson said warmly to the diving officer. ‘Let’s try to give that ice a nudge. Are we slewing?’

      ‘Bearing constant.’

      Swanson nodded. The pumps hummed, pouring out water, lightening ship, steadily increasing positive buoyancy. The ice stayed where it was. More time passed, more water pumped out, and still nothing happened. I said softly to Hansen: ‘Why doesn’t he blow the main ballast? You’d get a few hundred tons of positive buoyancy in next to no time and even if that ice is forty inches thick it couldn’t survive all that pressure at a concentrated point.’

      ‘Neither could the Dolphin,’ Hansen said grimly. ‘With a suddenly induced big positive buoyancy like that, once she broke through she’d go up like a cork from a champagne bottle. The pressure hull might take it, I don’t know, but sure as little apples the rudder would be squashed flat as a piece of tin. Do you want to spend what little’s left of your life travelling in steadily decreasing circles under the polar ice-cap?’

      I didn’t want to spend what little was left of my life travelling in steadily decreasing circles under the ice-cap so I kept quiet. I watched Swanson as he walked across to the diving stand and studied the banked dials in silence for some seconds. I was beginning to become a little apprehensive about what Swanson would do next: I was beginning to realise, and not slowly either, that he was a lad who didn’t give up very easily.

      ‘That’s enough of that lot,’ he said to the diving officer. ‘If we go through now with all this pressure behind us we’ll be airborne. This ice is even thicker than we thought. We’ve tried the long steady shove and it hasn’t worked. A sharp tap is obviously what is needed. Flood her down, but gently, to eighty feet or so, a good sharp whiff of air into the ballast tanks and we’ll give our well-known imitation of a bull at a gate.’

      Whoever had installed the 240-ton air-conditioning unit in the Dolphin should have been prosecuted, it just wasn’t working any more. The air was very hot and stuffy – what little there was of it, that was. I looked around cautiously and saw that everyone else appeared to be suffering from this same shortage of air, all except Swanson, who seemed to carry his own built-in oxygen cylinder around with him. I hoped Swanson was keeping in mind the fact that the Dolphin had cost 120 million dollars to build. Hansen’s narrowed eyes held a definite core of worry and even the usually imperturbable Rawlings was rubbing a bristly blue chin with a hand the size and shape of a shovel. In the deep silence after Swanson had finished speaking the scraping noise sounded unusually loud, then was lost in the noise of water flooding into the tanks.

      We stared at the screen. Water continued to pour into the tanks until we could see a gap appear between the top of the sail and the ice. The pumps started up, slowly, to control the speed of descent. On the screen, the cone of light thrown on to the underside of the ice by the flood-lamp grew fainter and larger as we dropped, then remained stationary, neither moving nor growing in size. We had stopped.

      ‘Now,’ said Swanson. ‘Before that current gets us again.’

      There came the hissing roar of compressed air under high pressure entering the ballast tanks. The Dolphin started to move sluggishly upwards while we watched the cone of light on the ice slowly narrow and brighten.

      ‘More air,’ Swanson said.

      We were rising faster now, closing the gap to the ice all too quickly for my liking. Fifteen feet, twelve feet, ten feet.

      ‘More air,’ Swanson said.

      I braced myself, one hand on the plot, the other on an overhead grab bar. On the screen, the ice was rushing down to meet us. Suddenly the picture quivered and danced, the Dolphin shuddered, jarred and echoed hollowly along its length, more lights went out, the picture came back on the screen, the sail was still lodged below the ice, then the Dolphin trembled and lurched and the deck pressed against our feet like an ascending elevator. The sail on the TV vanished, nothing but opaque white taking its place. The diving officer, his voice high with strain that had not yet found relief, called out. ‘Forty feet, forty feet.’ We had broken through.

      ‘There you are now,’ Swanson said mildly. ‘All it needed was a little perseverance.’ I looked at the short plump figure, the round good-humoured face, and wondered for the hundredth time why the nerveless iron men of this world so very seldom look the part.

      I let my pride have a holiday. I took my handkerchief from my pocket, wiped my face and said to Swanson: ‘Does this sort of thing go on all the time?’

      ‘Fortunately, perhaps, no.’ He smiled. He turned to the diving officer. ‘We’ve got our foothold on this rock. Let’s make sure we have a good belay.’

      For a few seconds more compressed air was bled into the tanks, then the diving officer said: ‘No chance of her dropping down now, Captain.’

      ‘Up periscope.’

      Again the long gleaming silver tube hissed up from its well. Swanson didn’t even bother folding down the hinged handles. He peered briefly into the eyepiece, then straightened.

      ‘Down periscope.’

      ‘Pretty cold up top?’ Hansen asked.

      Swanson nodded. ‘Water on the lens must have frozen solid as soon as it hit that air. Can’t see a thing.’ He turned to the diving officer. ‘Steady at forty?’

      ‘Guaranteed. And all the buoyancy we’ll ever want.’

      ‘Fair enough.’ Swanson looked at the quartermaster who was shrugging his way into a heavy sheepskin coat. ‘A little fresh air, Ellis, don’t you think?’

      ‘Right away, sir.’ Ellis buttoned his coat and added: ‘Might take some time.’

      ‘I don’t think so,’ Swanson said. ‘You may find the bridge and hatchways jammed with broken ice but I doubt it. My guess is that that ice is so thick that it will have fractured into very large sections and fallen outside clear of the bridge.’

      I felt my ears pop with the sudden pressure change as the hatch swung up and open and snapped back against its standing latch. Another more distant sound as the second hatch-cover locked open and then we heard Ellis on the voice-tube.

      ‘All clear up top.’

      ‘Raise the antennae,’ Swanson said. ‘John, have them start transmitting and keep transmitting until their fingers fall off. Here we are and here we stay – until we raise Drift Ice Station