“Where does the rest go?”
“Fissures and cracks above me. This ice may look solid, but it’s really a mass of fallen slabs.”
Jack rolled over until he was lying face-down on the shelf. With his left hand he gripped the ledge to prevent himself from slipping into the slurry, and with his right hand he reached up and grasped the axe. He let himself go, sliding into the brash until he was kneeling on the bottom with the surface at waist level. He wrestled to remove his fins, drawing them up on their retaining straps behind his calves, then pulled the axe down with both hands and swivelled it so the bit was above him. Standing in the slurry, his tall frame bent low under the ceiling, he would have just enough room to wield the axe in short spans, though each heft would require extra effort as he struggled to maintain balance and momentum.
“Here goes.” He placed the axe blade on the ice just above water level in front of Costas’ face and took a short swing. The blade was dull but the metal still had the strength of a thousand years ago, and it was the force of impact rather than the cutting edge that mattered. As the bit struck it broke off a shard of ice and sent tiny fracture marks in a web from the point of impact, reducing his view of Costas to a meaningless mosaic. “I can just do it,” Jack panted. “Six inches less space and I wouldn’t have the momentum.”
Slowly, deliberately, he began to hack at the ice, each blow striking off another shard, and each swing sending a jolt of pain through his leg. With the additional strain of holding up the weight of his cylinder pack above water, the exertion soon started to tell, and he began to breathe his trimix at an alarming rate. He tried to ignore the digital readout inside his visor and focus on the task at hand. He was deploying a standard woodsman’s technique, cutting a wedge above and below his baseline. As each wedge deepened he struck off larger chunks from the space between, extending the hole until it was only inches from Costas and almost wide enough for him to get through.
As he lined up for the critical blow his legs suddenly buckled under him and he slipped back into the slurry, dropping the axe. He realised that he had not simply lost balance: he had been toppled by some greater force. He righted himself and saw the surface of the water shaking violently, and heard distant groans and cracks. Suddenly the water began to rise, and Jack saw a dark fissure opening in the ceiling of the chamber.
“The air pocket’s going,” he exclaimed. “It’s escaping upwards.” He heaved the axe out of the slurry and flung it against the cut one more time, but to no avail. “The hole’s already under water. I can’t get any momentum.”
He slid back against the back wall of the chamber, the axe hanging from his hand, and watched helplessly as the water level rose above his visor and reached the ceiling. Less than a minute after the crack had appeared, all that was left was the tumult of bubbles cascading upwards from his own exhaust, and that quickly dissipated through the crack after each exhalation. The temperature readout on his visor had dropped to -2 degrees Celsius, below the freezing point of the water. He realized with sickening certainty that the coil would never cope with the quantity of water now filling the chamber; only the lower portion around the filaments would remain liquid.
Brash began to form in front of his eyes. He felt the water stiffen around his arms and head. It was happening again, a hellish torment he was fated to endure repeatedly, a nightmare relived. He stared wide-eyed as the ice began to encapsulate him. He began hyperventilating, as if his body were willing him to suck away his last reserve of trimix and lapse into blackness, a merciful oblivion in the face of the lingering horror that lay ahead of him.
“Your oxygen! Cut your oxygen hose!”
The voice snapped him back into reality. He instantly realised what Costas meant. He dragged his left arm through the slurry and pulled out the knife he kept in a sheath on his chest, bringing the serrated edge up against the two hoses under his helmet. For an appalling moment he forgot which was trimix and which was oxygen, the narcotic effect of nitrogen at this pressure playing tricks on his mind. His head was nearly immobile and he was unable to see down to the hoses. He shut his eyes and resolutely grasped the left hose, bringing the blade to bear just under the point where it fed into his helmet.
“What’s left in your oxygen cylinder should fill the chamber long enough to clear the hole for another couple of blows,” Costas said. “But for God’s sake don’t breathe it. Eighty per cent oxygen at this depth would mean instant death.”
Jack slashed the hose and a huge geyser of bubbles erupted into the chamber. The water rapidly lowered to chest level and he heaved himself up again, the severed hose dancing and hissing in front of him. He pulled the axe out of the brash and aimed it at the hole. With all his strength he swung against the ice, causing a large chunk to break free. He could see Costas pushing with all his might against the remaining barrier. Jack frantically pulled the floating chunk of ice aside and aimed another blow. Just then the hissing of his oxygen hose faltered, and the water level began to rise again, inexorably. He had one last chance. He lined up above the fracture line where the chunk had broken off, then relaxed completely, his eyes glued on the point of impact. He swung the axe back and brought it forward with all his might, causing a spray of brash as the blade skimmed over the rising water and slammed into the ice. Then he slumped back and began to pant uncontrollably, sending geysers of bubbles out of his exhaust as the water rose and submerged him again.
The corner of a fin appeared out of the ice. Jack felt a nudge against his body. It had worked. Another chunk of ice floated past, and a large black form emerged beside him like an inquisitive seal. Costas’ eyes looked into Jack’s. “Am I glad to see you.”
“Thank God you lost weight,” Jack said weakly. “I didn’t book a double room.”
A spurt of red filled the water between them as Jack shifted in the confined space. “How’s the leg?” Costas asked.
“That’s the least of my worries.” Jack peered at the water level above them. “Your oxygen,” he said urgently. “Cut your hose and we’ll have a few more minutes.”
“No good,” Costas said. “My hose blew when the berg rolled. The shard of ice that cut it nearly decapitated me.” He struggled around until he was lying parallel to Jack, both of their heads now facing the ledge where the ice probe was embedded. The narrow confines of the chamber became even more apparent, barely large enough for the two of them festooned with all of their equipment. They were now completely submerged, slivers of ice from Jack’s efforts floating around them, and Jack could see the filaments from the coil tangled below. Costas leaned down to pull his fins up his calves and then hauled himself behind the probe. “It’s flashing amber,” he said. “The battery’s nearly dead. If we stick around here we’ll be on ice. Permanently.” He slid back down and struggled to remove something from the thigh pocket of his E-suit. “Here, hold on to this for me.”
Jack took it, then stared back at Costas. “C-4 explosive?”
“You got it. Always carry some in case of emergency.”
“You’re going to blow us up.”
“Beats the deep freeze.” Costas continued to delve in his pocket, then pulled out a miniature detonator transceiver. “I’m certain we’re inside the crevasse where Kangia and those Nazis saw the longship. The clear ice is meltwater that sealed up the crevasse. It’s weaker than the surrounding glacier ice, and fragmented when the berg shifted. We might be able to widen the crack. It’s the only chance we’ve got.”
“What’s our decompression status?”
“Not good. Our depth seems to be dropping. There must be an internal water level in the crevasse above us, below the level of the sea surrounding the berg. Somehow it’s filling up. At this rate we’ll be in the danger zone in less than five minutes.”