“That’s about how much trimix I’ve got left.”
“If we don’t freeze up first. With the coil dead the water’s already beginning to thicken. Time to get this show on the road.”
Jack shivered violently. The water was as cold as he had ever known, colder than the deepest ocean depths. There was another ominous creak in the ice, and the crack above them closed in perceptibly. Costas rolled over and looked up, panning his headlamp along the silvery shimmer of exhaust bubbles that lined the ceiling. “That’s not what I wanted to happen,” he said quietly. A brief high-pitched alarm sounded from the probe, and the amber light went dead. “Nor was that.” He rolled back and picked up the axe from the floor of the chamber, feeding it towards Jack. “You’ve got a longer reach than me. The crack’s widest above the probe. I need you to push the C-4 as high up as you can. It’s already armed.”
Jack held the brown packet in one hand and the haft of the axe in the other. Costas sank behind him and heaved up against his legs, forcing another pulse of blood from Jack’s thigh. Jack tried to ignore the pain and twisted his upper body so that his visor was up against the crack above the probe. With the rush of bubbles escaping through it he could only get a fleeting sense of its dimensions, but it was clearly a narrow chimney that extended high above them, a crack between the slabs of ice. He pushed the C-4 as far up as he could with his left arm, wedging it in the chimney. Then he pulled the axe up hand over hand and fed the wooden haft into the chimney, with Costas preventing him from sliding back. When he felt the haft meet resistance, he pushed up hard, dislodging the C-4 and thrusting it as high as he could into the chimney.
“Okay. That’s as far as I can go.”
Jack sank down beside Costas, and the two of them struggled against the freezing brash until they were as far away from the ice chimney as they could get, pressed against each other in the opposite corner of the chamber. Jack reversed the axe and fed it back under his straps, and both men reached down to slide their fins into place. Jack wrapped his arms tight around Costas, their faces pressed visor to visor. “Wherever we’re going this time, we’re going together.”
“Semper fidelis.”
Jack shook his head. “You never cease to amaze me. Latin too.”
Costas held up the transceiver between them. “Good to go?”
“Good to go.”
A violent tremor shook them, accompanied by a shrieking and tearing sound that set Jack’s teeth on edge. All around them the ice was a blur of vibration. The cacophony was rent by a deafening explosion and Jack felt his body pummelled as if by a thousand punches. He pressed his visor tight against Costas, protecting the vulnerable glass from the shards of ice that were flying around them. Almost simultaneously their headlamps burst and they were plunged into a bizarre, tremulous darkness, broken only by the blurry green of the digital readouts inside their helmets. Something huge thumped against Jack’s side and for an instant he felt he was about to be crushed, and then by a miracle it passed. He felt a rush of dizziness and realised they were tumbling, spinning round and round in a ferment of ice and water, utterly helpless as the crevasse rent asunder.
“We’re getting shallower!” Costas yelled. “For God’s sake don’t hold your breath. Your lungs would blow in seconds.”
Jack’s breathing began to tighten. In the swirling maelstrom there were no way-markers, no visual points of reference. He forced himself to concentrate on the digital readout inside his visor, his arms clinging tight to Costas and their legs intertwined. Jack could just make out a depth reading of ten metres, and they were rocketing upwards. The figures gave him something to grasp on to, and he was dimly aware that the danger of air embolism was compounded by the risk of the bends, of decompression sickness. They were coming up way too fast.
Suddenly they were on the surface. It was light again, a steely, crepuscular light, and Jack could see beyond Costas to an awesome world of blue. They were floating in a vast cauldron of ice, at least the length and breath of Seaquest II, with sheer white walls rising all around them. Jack felt dwarfed by the enormity of it. He arched his neck and looked at the source of light far above. It was a thin sliver of grey where the ice walls nearly joined, a first link to the world outside. The grey was streaked with black and light blue, and seemed to be rushing past at enormous speed.
“It must be one of those freak storms coming off the ice cap,” Costas said. “That’s what pushed the berg.”
“A piteraq.”
They clung to each other as they bobbed in the centre of the pool. Their decompression warning lights were flashing amber, indicating that they had pushed the envelope and were now in grave danger of the bends. Jack felt for any signs, a tingle in an elbow or a sudden surge of nausea, aware that the last six months away from diving might have reduced his resistance. He checked his trimix pressure gauge and saw the dial hovering at zero. “I’m out of air,” he said. “If there’s any more diving we’ll have to buddy-breathe.”
“Hook into me.”
Jack pulled the umbilical hose from the top of Costas’ cylinder pack and pressed the valve into an inlet under his helmet. With a sharp hiss his helmet filled up again with breathing gas, its makeup now close to atmospheric air as the computer adjusted the ratios to take account of their depth. Jack realised he had been running on empty, and he closed his eyes to concentrate on taking a few deep breaths.
“That should give us about ten minutes,” Costas said. “I’d prefer to spend it ten metres deep to increase the decompression margin, but we don’t have that luxury. We’ll just have to wing it.”
The movement in the water had died down dramatically, leaving the surface preternaturally calm after the tumult that had ejected them from the icy tomb far below. “The crevasse must have opened up when the berg moved, shattering all the meltwater ice inside it,” Costas said. “Then the walls closed in again as the berg encountered resistance, probably the seaward edge of the threshold.” He looked round again, the scene now eerily still. “I’ve got a bad feeling about this. Let’s keep together.”
As if on cue, the silence was rent by a shattering concussion, and ice and water disintegrated in another shuddering blur. Jack became aware of a curtain of ice falling around them, jagged spears that sliced into the water like shrapnel. He concentrated all of his energy on holding Costas tight, knowing that if the hose that was his sole remaining lifeline were to rip out he would drown. He flashed back to the body in the ice, to his hallucination, then woke to a worse reality. They were dropping with sickening speed, sliding down a whirlpool of grinding ice, as if they were being sucked back to the frozen warrior and the place that had nearly been their nemesis. The water was falling away so fast that they were dropping through air, suspended half in and half out of the water, tumbling weightlessly against the chunks of ice that were splintering around them. Costas pulled Jack closer, straining against the centripetal force of the whirlpool, and pressed his visor hard against Jack’s. “The water’s being sucked down as the crevasse opens,” he yelled. “Hold on tight. I might be able to reverse the flow.”
Suddenly the water billowed up around them and they were immersed deep within it. For a terrifying moment Jack felt the air crushed out of his lungs by some force that was working against the vortex, propelling them back upwards. Then they erupted out of the water, bouncing on a plume of brash that threw them high into the cleft above the cauldron. They crashed into a wall of ice and slid upwards, each scrabbling desperately with one free hand for some kind of hold. Then they began to slide back downwards, out of control, until they hit a ledge that held them precariously on the wall. As they crouched dripping together on the icy platform, the plume of brash and spray dropped back into the seething cauldron at the base of the crevasse far below them.