But the draw of the sea enticed him to leave the flight line and a promising military career to join a newly created federal organization, the National Underwater and Marine Agency. Created to study and protect the world’s oceans, NUMA was the perfect home for Pitt, allowing him to work on and beneath the sea, all over the world. After years as its Special Projects Director, he now found himself heading the agency, which only fortified his sense of stewardship of the world’s oceans. Loren often joked that she still competed with Pitt’s first love, his mistress called the sea.

Pitt’s quest for underwater discovery, along with a love of history, had led him to discover dozens of shipwrecks. But this afternoon, the object of his search was considerably smaller. Eyeing a thick ridge of jagged rocks that stretched into deeper water, he swam over and surveyed its crevices. After several minutes, he found what he was looking for. He plunged an arm between two boulders and pulled out a spirited brown spiny lobster that weighed almost five pounds. He eyed its long, waving antennas for a moment and then stuffed the crustacean into a mesh dive bag and began a search for its twin.

Above the noisy rhythm of his regulated breathing, a faint tapping rippled through the water.

He held his breath to hear better. The metallic rapping repeated a familiar cadence—two short raps, two long raps, then two short raps. It wasn’t exactly the Morse code distress call of SOS, which used three dots and dashes, but Pitt guessed the intent was the same. He could not determine its direction, only that the source was nearby. It had to be Loren.

He kicked toward the surface, angling for the position of the speedboat. He spotted the anchor line and approached it, swimming hard, surfacing a few yards behind the boat. Loren was leaning over the transom, pounding a spare diver’s lead weight on the stern drive housing. Engrossed in her signaling, she didn’t notice him emerge.

“What’s wrong?” he shouted.

She looked up, and Pitt saw a desperate fear in her eyes. Lost for words, she simply pointed behind him. He spun his head around—and was engulfed in a massive shadow.

It was a ship, a massive bulk carrier, bearing down on them barely a hundred feet away. The speedboat bobbed in the direct path of the ship’s broad, high bow, which pushed an ominous mountain of white foamy water in front of it. Pitt cursed the fools on the bridge, who were either blind or asleep.

Without hesitation, he kicked and stroked furiously to the boat until he could reach an arm over the side.

“Should I start the motor?” Loren’s face was drawn. “I was afraid to try while you were underwater.”