Stretching across the boat’s bench seat, she hung a leg over the side and dipped her toes in the water. “Yikes! That water is cold. I’m going to stay warm and dry up here, thank you very much.”

“I won’t be gone long.” Her husband stuck a regulator between his teeth, stared admiringly at his wife for a moment, then fell backward into the blue Pacific. He playfully kicked a spray of water onto his wife with a fin before he disappeared under the surface.

Toweling herself off, Loren tracked her husband’s air bubbles for a few minutes, then gazed across the horizon. The afternoon air was crystal clear, the sapphire sky nearly matching the color of the ocean. They’d anchored the red speedboat a half mile off the Chilean coast, opposite a small beach called Playa Caleta Abarca.

A towering Sheraton Hotel stood on a rock cliff nearby, its outdoor pool crowded with sun-worshiping tourists. A short distance to the south lay Valparaiso, Chile’s colorful and historic seaport long known by sailors as the “Jewel of the Pacific.” Ancient buildings climbed the steep hills ringing the city, reminding Loren of San Francisco. She noted a large white cruise ship, the Sea Splendour, anchored in the bay, shuttling passengers ashore to visit the beaches of Viña del Mar or to trek to Chile’s capital city of Santiago, sixty miles southeast.

A gentle swell rocked the speedboat as Loren turned her gaze to sea. A small yellow sailboat passed by, then tacked north toward an approaching freighter, its triangular sail fluttering. She leaned back on the padded seat, closed her eyes, and luxuriated in the warmth of the sun.

Sixty feet beneath her, Dirk Pitt had just shaken the ocean’s chill that permeated the country’s coastal waters due to the Humboldt Current. His breath rate eased as he slowed his descent. The visibility was good, about forty feet, allowing him clear view of a rocky bottom anchored with thick seaweed. Kicking his fins lazily, he glided over a coral-strewn ledge crowded with brightly colored urchins and starfish. A small school of jack mackerel eyed him for a minute or two, then darted away.

The sea relaxed Pitt in a way nothing else could. To some it was confining, but Pitt found the ocean depths produced in him an odd feeling of release that seemed to heighten his senses. It was an experience born decades ago, when he spent the better part of his youth exploring the coves along the Southern Californian coastline, free diving and bodysurfing. The allure was like that of flying, which had led him to the Air Force Academy and flight school as a young officer.