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Minute crawled after minute as the two men leaned against the drill with all their might. They didn't talk to each other. They didn't have to. Each had read the other's mind for more than forty years. They worked like a matched pair of draft horses.
Pitt bordered on frantic when he could see no more movement within the habitat. The deeper into the view port the bit bored, the faster it penetrated. At last Pitt and Giordino felt it burst through. They instantly jerked the drill back. Almost before Pitt could switch it off, Giordino was shoving an air tank and a regulator through the ten-inch-diameter round hole, helped by the water that forced it into the lower air pressure inside.
Pitt wanted to shout for his kids to react, but they could not have heard him. He could see that Summer made no effort to move. He was starting to retrieve the drill to enlarge the hole enough to crawl through, when Dirk weakly reached out for the regulator and clamped his teeth on the mouthpiece. Two deep breaths and he became aroused to normalcy again. He immediately and gently eased the mouthpiece between Summer's lips.
Pitt wanted to cheer in euphoria when he saw Summer's eyes flutter open and her chest began to rise and fall. Though the inrush of water was rapidly filling the interior of the habitat, they now had more than enough air to breathe. He and Giordino picked up the drill again and attacked the view port in an effort to enlarge the hole big enough for the two inside to escape. There was no feverish effort this time. They took turns widening the opening until the circular cuts had grown into a four-leaf clover broad enough for a body to slip through.
"Paul," Pitt called on his headphone.
"I'm listening," Barnum answered.
"The hyperbaric chamber?"
"Ready to receive them the minute they come on board."
"At what depth and how long have they been down on Pisces?"
"They've been pressurized at sixty feet for three days and fourteen hours."
"Then they'll need at least fifteen hours of decompression."
"Whatever time it takes," said Barnum. "I have an expert on hyperbaric medicine on board. He'll compute their decompression time."
Giordino signaled that he had finished drilling the final hole. The interior of the habitat was nearly filled with water now, the condensed air pressure restricting the flow. He reached in, took Summer by the hand and pulled her outside. Dirk passed through one of the air tanks. Summer started to wrap her arms around it and inhale through the mouthpiece of the regulator. Then, suddenly, she waved her hands in a wait signal and disappeared back inside the habitat. She quickly reappeared, clutching her notebooks, computer disks and the digital camera in a watertight plastic bag. Giordino took her by the arm and led her up to the surface.
Dirk came next with the second spare tank. Pitt gave him a quick embrace before they ascended together toward the only remaining inflatable. No sooner were the brother and sister pulled safely into the boat than Cristiano pushed the throttles forward and sped off toward the research ship. Pitt and Giordino, saving a couple of minutes by not climbing aboard too, remained in the water and pushed themselves clear before being chopped by the spinning propellers.
When Lelasi returned and picked them up, Pitt's son and daughter were already inside the hyperbaric chamber. The basis behind decompression sickness, or what is known as the bends, is that under normal air pressure the body respires most of its excess nitrogen. However, under increasing pressure as a diver descends, nitrogen increases in the bloodstream. As a diver ascends and the surrounding water pressure decreases, pure nitrogen bubbles form in the blood and eventually become too large to pass through tissue. In order for the bubbles to diffuse and pass through lung tissue, the diver must sit inside a chamber that very slowly decreases pressure while breathing one hundred percent oxygen.
Dirk and Summer passed the long hours inside the chamber reading and writing reports on their findings about the dying coral and the brown crud, as well as recording their impressions of the cavern with the ancient artifacts, all while being monitored by the hyperbaric physician.
The stars glittered like diamonds and the lights of the high-rise condominiums beamed as Sea Sprite sailed into Fort Lauderdale's Port Everglades, one of the busiest deepwater ports in the world. The research ship's deck lights blazed as she slowly sailed past a long line of luxury cruise ships loading passengers and supplies for a morning departure. Alerted by the Coast Guard, every ship in the harbor blew three blasts of their whistles and air horns in salute as Sprite passed on her way to the NUMA dock facilities.
Her epic rescue of the Ocean Wanderer and her thousand guests forty-eight hours earlier was worldwide news. Pitt dreaded the media reception that would be waiting at the dock. He leaned over the railing on the bow and watched the black water, streaked by flashes of light that sparkled white off the bow. He became aware of a figure beside him, and he turned and looked into the smiling face of his son. It never ceased to amaze him that it was like looking into a mirror of himself twenty-five years ago.
"What do you think they'll do with her?" Dirk asked.
Pitt's eyebrows raised. "Do with what?"
"Pisces."
"The decision whether to salvage her or not rests with Admiral Sandecker. Getting a barge with a crane over the coral might prove impossible. And even if it could be done, pulling sixty-five tons of deadweight up through the narrow confines of the crevasse might prove cost-prohibitive. Chances are the admiral may simply write it off."
"I wish I could have been there to see you and Al drag the lines tied to the hotel's mooring cables to Sea Sprite.'"
Pitt smiled. "I doubt if either one of us would volunteer to attempt it again."
It was Dirk's turn to smile. "I'd have to bet against you on that one."
Pitt turned and leaned his back against the railing. "Are you and Summer fully recuperated?"
"We passed our balance and comparative sensitivity tests with flying colors and have no sign of aftereffects."
"Different symptoms can turn up days or weeks later. Better you and your sister take it easy for a while. In the meantime, if you're so anxious for something to do, I'll give you a chore."
Dirk gave his dad a suspicious look. "Like what?"
"I'll arrange a meeting with St. Julien Perlmutter. You two can work with him to come up with answers about those ancient artifacts you found on Navidad Bank."
