“What the hell was that?” Jack panted, peering down a sheer drop of at least thirty metres.
“The C-4,” Costas said exuberantly. “We were ejected from that chamber before I had a chance to blow it, but it came in useful after all.” He shoved the detonator transceiver into his thigh pocket. “Right. I’m cold and hungry. Let’s get out of here.”
“Better make it fast. Take a look at that.”
They peered down in horrified fascination at the ice chasm far below. It was beginning to narrow again, the walls compressing the slurry of ice and pushing it upwards. As the larger chunks were caught in the vise they exploded with a shattering resonance, sending lethal shards far up the crevasse. They knew that being caught in the maelstrom this time would mean instant death, their bodies shredded by the flying ice and then crushed as the crevasse caught them like a meat grinder. Relentlessly, terrifyingly, the gap was closing in on them, advancing like some living thing, its deadly maw spewing a geyser of splintering and shattering ice, moving with alarming speed up the cleft even in the few moments they had been watching.
“This is it,” Costas yelled above the din. “No second chance this time.” They swivelled on the ledge and faced upwards. The skylight at the top of the crevasse was about fifty metres away, rushing streaks of grey now clearly visible on a background of blue. Suddenly the clouds parted and a dark shape appeared, blotting out the cleft, a blinding spotlight aimed directly at them. Then it veered away violently, trailing something that streamed out behind and whipped over the crack.
“It’s the Lynx,” Costas shouted excitedly. “They’re trying to drop a winch.”
“I told them to stay away. They’re pushing their luck against that wind.”
“They could hardly do nothing.”
“There’s no way they’ll get that cable down here. They must be waiting, hoping we can get to the entrance of the crevasse.”
Jack glanced down. The gap was now terrifyingly close, no more than twenty metres below them, the shards of exploding ice almost reaching the ledge. He looked up again. The crevasse was glassy smooth, offering no handholds. The euphoria at seeing the helicopter suddenly turned to cold dread. It was another nightmare, a return to his brush with death years before in the flooded mine shaft, where the end of the tunnel had been in sight but no matter how frantically he tried to swim for it he seemed to stay the same distance away.
Jack suddenly felt as if he were being pressed into the wall. He looked up again, then it dawned on him. “The crevasse. Isn’t it supposed to be vertical?”
“Holy shit. The berg’s rolling!”
There was a huge lurch and everything went still. The cleft had seized up, no more than ten metres below them. Through the skylight they were looking directly at the promontory where they had visited the old Inuit the day before. Jack found himself thinking that it was going to be a perfect day, that the wind was leaving the land washed in sparkling light. Then he felt the dread again. They had to reach the crack or they would die. When the berg rolled again the skylight would drop underwater, taking them into the abyss as it toppled off the threshold, sealing their fates in an instant.
“The axe!” Costas shook him. “The axe!”
Jack snapped back into reality. With his left arm still around Costas, he reached back and drew the axe from its straps. His hand was sticky with blood where it had brushed his thigh and the axe nearly slipped away, saved only by Costas’ iron grip. They dangled the axe together down the slope, then flung it in a wide arc to lodge in the ice ahead of them.
“It’ll hold,” Jack panted. “Pull yourself up.” He tensed his body, his fins still planted on the ledge but his elbows and knees ready to find any undulation in the ice, anything that might stop him from sliding. They heaved up on the haft, then shook it frantically until it was loose. For a few seconds they would be totally without anchor, held only by the tension of their bodies against the ice. Costas looked Jack full in the eyes and nodded. Jack let the axe slide down again and heaved. It arched overhead, skimming the back of the crevasse, then slammed into the ice a metre and a half ahead of them. As Jack craned his head up to free the axe for another blow, he saw a black-clad diver dangling from a cable no more than a hundred metres beyond the berg. He realised that the noise he was hearing was the din from the Lynx’s twin turboshafts.
There was another lurch, and a rumble from the cleft behind them. The noise of the helicopter was drowned out by an immense creaking in the ice. The walls of the crevasse narrowed. The axe was poised but there was no more room to swing it. Another lurch brought up a surge of brash from the cleft, washing over them, then everything happened at once. The skylight was lost in a foment of water, a sucking whirlpool that rose up towards them, and suddenly they were sliding uncontrollably, plummeting towards the skylight as it angled into the abyss. Jack hit the incoming seawater with an immense crash, the axe trailing behind him, then was pulverised by the force of the water cascading down from the maw of the crevasse. The icy brash that had so nearly been their nemesis pushed them out of the berg, ejecting them in a frenzied tumble just as the walls of ice crushed together and sealed the crevasse for the last time.
It was not over yet. Jack saw a vast wall of sculpted white advancing on them, extending as far as he could see in every direction. Already the crevasse was far below, marked only by a trickle of bubbles rising up the side of the berg, framing the black immensity of the abyss. As the berg rolled, Jack had the illusion that he was rocketing upwards, yet his body told him exactly the opposite. “It’s pulling us down,” he yelled to Costas, his voice contorted. “Inflate your suit and swim for it!”
Jack pressed the inflator and began to fin hard, his left arm gripping Costas’ shoulder. His depth readout showed they were hardly moving at all. They were still in the grip of the berg, being sucked down. He looked up and saw the sun shimmering off the waves, tantalizingly close. He felt the cold again in the pit of his stomach. Having survived the iceberg, they were about to die within sight of the surface. This could not be happening. He began to hyperventilate, to outstrip the oxygen remaining in Costas’ cylinder. His breathing began to tighten.
“I’m ditching your tanks.” Costas was breathing heavily, a great plume of bubbles encircling his exhaust, and he finned furiously as he disconnected Jack’s redundant hoses and flipped the quick-release buckle on his cylinder packs, sending the oxygen rebreather and the console backpack with its empty trimix cylinders plummeting into the depths. “I’m doing the same to mine,” he panted. “We’ve only got about a minute’s air left anyway and it isn’t doing us any good. Get ready to disconnect your hose. Stop finning now and when I say so take five deep breaths.”
“I’m holding on to you,” Jack said, his breath coming in short gasps. “If you go down, I’m going with you.”
Costas disconnected his rebreather and it dropped out of sight. With his left hand he flipped the quick-release on his backpack and held it in place, and with his right hand he found the disconnect to the hose under his helmet. Already they were plummeting down, sucked deeper and deeper by the rolling iceberg, their chances receding with every metre they dropped into the abyss.
“Now!” Jack took five deep breaths, then yanked the umblical. Simultaneously Costas released his hose and backpack. With Jack’s left arm on Costas’ shoulder, they began to swim determinedly upwards, taking wide, hard strokes with their fins, Jack still clutching the axe in his right hand. For a few moments he felt fine, his bloodstream brimming with oxygen, and he remembered to breathe out as he ascended. Then the effort of their escape began to take its toll, and he felt the first niggle of discomfort. They were rising steadily, a metre every couple of seconds, but they were still more than twenty metres from the surface. Any letup in their finning and they would be dragged back down again. Jack started to suck on empty, his lungs instinctively heaving for more air, drawing the last dregs out of his helmet.