“Arc gouging,” Pitt explained to Plunkett. “They’re going to sever all mounts, drive shafts, and electrical connections until the control housing breaks free of the main frame and track mechanism.”
Plunkett nodded in understanding as Giordino extended the other arm until a spray of sparks signaled the cutting discs were attacking their target. “So that’s the ticket. We float to the surface as pretty as an emptied bottle of Veuve Cliquot-Ponsardin Gold Label champagne.”
“Or a drained bottle of Coors beer.”
“First pub we hit, Mr. Pitt, the drinks are on me.”
“Thank you, Dr. Plunkett. I accept, providing we have enough buoyancy to take us up.”
“Blow the guts out of her,” Plunkett demanded recklessly. “I’d rather risk the bends than certain drowning.”
Pitt did not agree. The excruciating agony divers had suffered over the centuries from the bends went far beyond man-inflicted torture. Death was a relief, and survival often left a deformed body racked with pain that never faded. He kept a steady eye on the digital reading as the red numbers crept up to three atmospheres, the pressure at roughly twenty meters. At that depth their bodies could safely endure the increased pressure squeeze, he estimated, in the short time remaining before nitrogen gas began forming in their blood.
Twenty-five minutes later, he was about to rethink his estimate when a growing creaking noise reverberated inside the compartment. Then came a deep grinding that was magnified by the density of the water.
“Only one mount and a frame brace to go,” Giordino informed them. “Be prepared to tear loose.”
“I read you,” replied Pitt. “Standing by to close down all power and electrical systems.”
Sandecker found it insufferable that he could plainly see the faces of the men across the thin gap separating the two vehicles and know there was every likelihood they might die. “How’s your current air supply?” he asked anxiously.
Pitt checked the monitor. “Enough to get us home if we don’t stop for pizza.”
There came a screech that set teeth on edge as the control compartment shuddered and tilted upward, nose first. Something gave then, and suddenly the structure acted as if it wanted to break free. Pitt quickly shut off the main generator power and switched over to the emergency batteries to keep the computer and speaker phone operating. But all movement abruptly stopped, and they hung frozen above the tractor’s huge frame.
“Hold on,” came Giordino’s reassuring voice. “I missed some hydraulic lines.” Then he added, “I’ll try to stay close if I can, but should we spread too far apart, the phone cable will snap and we’ll lose voice contact.”
“Make it quick. Water is gushing in through some of the severed lines and connections.”
“Acknowledged.”
“See to it you open your exit door and get the hell out fast when you hit the waves,” Sandecker ordered.
“Like geese with diarrhea,” Pitt assured him.
Pitt and Plunkett relaxed for a few seconds, listening to the sound of the cutting discs chewing through the tubing. Then came a heavy lurch followed by a ripping noise, and they began slowly rising from the top of the seamount, leaving the tractor chassis with Big John’s torn cables and melted debris dangling behind them like mechanical entrails.
“On our way!” Plunkett roared.
Pitt’s mouth tightened. “Too slow. The incoming water has lowered our positive buoyancy.”
“You’re in for a long haul,” said Giordino. “I judge your rate of ascent at only ten meters a minute.”
“We’re lugging the engine, reactor, and a ton of water with us. Our volume barely overcomes the excess weight.”
“You should rise a little faster as you near the surface.”
“No good. The water intake will offset the decrease in pressure.”
“No worry over losing the communication cable,” Giordino said happily. “I can easily match your ascent rate.”
“Small consolation,” Pitt muttered under his breath.
“Twenty meters up,” said Plunkett.
“Twenty meters,” Pitt echoed.
Both pairs of eyes locked on the depth reading that flashed on the display screen. Neither man spoke as the minutes crawled past. The twilight world was left behind and the indigo-blue of deep water paled slightly from the approaching filtered light from above. The color green made its first appearance, and then yellow. A small school of tuna greeted them before flashing away. At 150 meters Pitt could begin to make out the dial on his wristwatch.
“You’re slowing,” Giordino warned them. “Your rate of ascent has dropped to seven meters a minute.”
Pitt punched in the water leakage numbers. He didn’t like what he read. “Our flood level is redlined.”
“Can you increase your air volume?” asked Sandecker, concern obvious in his voice.
“Not without a fatal dose of the bends.”
“You’ll make it,” Giordino said hopefully. “You’re past the eighty-meter mark.”
“When our ascent drops to four meters, grab on with your hand assembly and tow us.”
“Will do.”
Giordino moved ahead and angled his vessel until the stern was pointing toward the surface and he was looking down on Pitt and Plunkett. Then he set his autopilot to maintain a reverse speed to maintain the same ascent speed as Big John’s housing. But before he could extend the robotic arm, he saw that the DSMV was falling back and the gap was increasing. He quickly compensated and closed the distance.
“Two meters a minute,” Pitt said with icy calm. “You’d better link up.”
“In the process,” Giordino anticipated him.
By the time the sub’s articulated hand system had managed a viselike grip on a protruding edge of wreckage, the compartment had come to a complete halt.
“We’ve achieved neutral buoyancy,” Pitt reported.
Giordino jettisoned the sub’s remaining iron ballast weights and programmed full reverse speed. The thrusters bit into the water and the sub, with the DSMV housing in tow, began moving again with tormented slowness toward the beckoning surface.
Eighty meters, seventy, the fight to reach daylight seemed as if it would never end. Then at twenty-seven meters, or about ninety feet, their progress stopped for the final time. The rising water in the engine room was coming in through new openings from newly ruptured pipes and cracks with the force of a fire hose.
“I’m losing you,” Giordino said, shaken.
“Get out, evacuate!” cried Sandecker.
Pitt and Plunkett didn’t need to be told. They had no wish for Big John to become their tomb. The manned housing began to descend, pulling the submersible with it. Their only salvation was the inside air pressure, it was nearly equalized with the outside water. But what fate gave them, fate snatched back. The flood couldn’t have picked a worse time to short out the emergency battery system, cutting off the hydraulic power for the exit hatch.
Plunkett frantically undogged the hatch and fought to push it out, but the slightly higher water pressure was unyielding. Then Pitt was beside him, and they put their combined strength into it.
In the submersible, Giordino and Sandecker watched the struggle with mounting fear. Negative buoyancy was rapidly increasing and the compartment was beginning to drop into the depths at an alarming rate.
The hatch gave as though it was pushed through a sea of glue. As the water surged around the frame and into the compartment, Pitt shouted, “Hyperventilate, and don’t forget to exhale on the way up.”
Plunkett gave a brief nod, took a quick series of deep breaths to eliminate the carbon dioxide in his lungs, and held the last one. Then he ducked his head into the water gushing through the hatch and was gone.