“It would appear there's something more to it than just a propeller,” Pitt said finally. “Leaking fuel from a submerged ship, or perhaps its cargo?”

“We did not detect abnormally high readings of petroleum compounds in the water samples,” the NUMA biologist stated.

“You never did tell us what you found,” Giordino said, raising a dark eyebrow at the biologist.

“Yes, you said you did identify toxins in the water, didn't you?” Biazon asked anxiously. “What was it that you found?”

“Something I've never encountered in salt water before,” she replied, shaking her head slowly. “Arsenic.”

The coral reef exploded with a rainbow of colors arranged in a serene beauty that put a Monet landscape to shame. Bright red sea anemones waved their tentacles lazily in the current amid a carpet of magenta-colored sea sponges. Delicate green sea fans climbed gracefully toward the surface beside round masses of violet-hued brain coral. Brilliant blue starfish glowed from the reef like bright neon signs, while dozens of sea urchins blanketed the seafloor in a carpet of pink pincushions.

Few things in nature rivaled the beauty of a healthy coral reef, Pitt reflected as his eyes drank in the assortment of colors. Floating just off the bottom, he peered out his faceplate in amusement as a pair of small clown fish darted into a crevice as a spotted ray cruised by searching for a snack. Of all the world's great dive spots, he always felt it was the warm waters of the western Pacific that held the most breathtaking coral reefs.

“The wreck should be slightly ahead and to the north of us,”

Giordino's voice crackled through his ears, breaking the tranquility. After mooring the Mariana Explorer over the site of the maximum toxin readings, Pitt and Giordino donned rubberized dry suits with full faceplates to protect them from potential chemical or biological contamination Dropping over the side, they splashed into the clear warm water that dropped 120 feet to the bottom. \

The readings of arsenic in the water had been startling to everyone. Dr. Biazon reported that arsenic seepage had been known to occur in mining operations around the country and that several manganese mines operated on Bohol Island, but added that none were located near Panglao. Arsenic was also utilized in insecticides, the NUMA biologist countered. Perhaps an insecticide container was lost off a vessel, or intentionally dumped? There was only one way to find out, Pitt declared, and that was to go down and have a look.

With Giordino at his side, Pitt checked his compass, then thrust his fins together, kicking himself at an angle across the invisible current. The visibility was nearly seventy-five feet and Pitt could observe the reef gradually rising to shallower depths as he glided just above the bottom. His skin quickly began to sweat under the thick dry suit, its protective layer providing more insulation than was required in the warm tropical waters.

“Somebody turn on the air-conditioning,” he heard Giordino mutter, verbalizing his own sentiments.

With eyes aimed forward, he still saw no signs of a shipwreck, but noted that the coral bottom rose up sharply ahead. To his right, a large underwater sand dune boiled up against the reef, its rippled surface stretching beyond Pitt's field of vision. Reaching the coral uplift, he tilted his upper body toward the surface and thrust with a large scissors kick to propel himself up and over its jagged edge. He was surprised to find that the reef dropped vertically away on the other side, creating a large crevasse. More surprising was what he saw at the bottom of the ravine. It was the bow half of a ship.

“What the heck?” Giordino uttered, spotting the partial wreckage of the ship.

Pitt studied the partial remains of the ship for a moment, then laughed through the underwater communication system. “Got me, too. It's an optical illusion. The rest of the ship is there, it's just buried under the sand dune.”

Giordino studied the wreck and saw that Pitt was right. The large sand dune that affronted the reef had built up partway into the crevasse and neatly covered the stern half of the ship. The current swirling through the crevasse had halted the onslaught of the sand at a point amidships of the wreck in a nearly perfect line, which gave the impression that only half a ship existed.

Pitt turned away from the exposed portion of the ship, swimming over the empty sand dune for several yards before it dropped sharply beneath him.

“Here's your propeller, Al,” he said, pointing down.

Beneath his fins, a small section of the ship's stern was exposed. The brown-encrusted skin curved down to a large brass propeller, which protruded from the sand dune like a windmill. Giordino kicked over and inspected the propeller, than swam up the sternpost several feet and began brushing away a layer of sand. From the curvature of the stern, he could tell that the ship was listing sharply to its port side, which was also apparent from the exposed bow section. Pitt floated over and watched as Giordino was able to expose the last few letters of the ship's name beaded onto the stern.

“Something maru is the most I can get,” he said, struggling to trench into a refilling hole of sand.

“She's Japanese,” Pitt said, “and, by the looks of the corrosion, she's been here awhile. If she's leaking toxins, it would have to be from the bow section.”

Giordino stopped digging in the sand and followed Pitt as he swam toward the exposed front of the ship. The vessel eerily emerged again from the sand dune at its main funnel, which jutted nearly horizontally, its top edged meshed into the coral wall. From its small bridge' section and long forward deck, Pitt could see that the vessel was a common oceangoing cargo ship. He judged her length at slightly more than two hundred feet. As they swam over the angled topside, he could see that the main deck had vanished, its wooden planking disintegrated long ago in the warm Philippine waters.

“Those are some ancient-looking hoists,” Giordino remarked, eyeing a small pair of rusty derricks that reached across the deck like outstretched arms.

“If I had to guess, I'd say she was probably built in the twenties,” Pitt replied, kicking past a deck rail that appeared to be made of brass. Pitt made his way along the deck until he reached a pair of large square hatch covers, the capstones to the ship's forward cargo holds. With the freighter's heavy list, Pitt had expected to find the hatch covers pitched off the storage compartments, but that wasn't the case. Together, the two men swam around the circumference of each hatch, searching for damage or signs of leakage.

“Locked down and sealed tight as a drum,” Giordino said after they returned to their starting point.

“There must be a breach somewhere else.”

Silently finishing his thought, Pitt slowly ascended until he could look down the curving starboard side and exposed hull. Surrounding the ship, the coral reef rose sharply on either side. Following his instincts, he swam down the starboard hull all the way to the partially exposed keel line, then moved slowly toward the bow. Kicking just a short distance, he suddenly halted. Before him, a jagged four-foot-wide gash stretched nearly twenty feet down the starboard hull to the very tip of the bow. The sound of whistling burst through his ears as Giordino swam up and surveyed the gaping wound.

“Just like the Titanic” he marveled. “Only she scraped herself to the bottom on a coral head instead of a chunk of ice.”

“She must have been trying to run aground on purpose,” Pitt surmised.

“Outrunning a typhoon, probably.”

“Or maybe a Navy Corsair. Leyte Gulf is just around the corner, where the Japanese fleet was decimated in 1944.”

The Philippine Islands were a hotly contested piece of real estate in World War II, Pitt recalled. More than sixty thousand Americans lost their lives in the failed defense and later recapture of the islands, a forgotten toll that exceeded the losses in Vietnam. On the heels of the surprise attack at Pearl Harbor, Japanese forces had landed near Manila and quickly overrun the U.S. and Philippine forces garrisoned at Luzon, Bataan, and Corregidor. General MacArthur's hasty retreat was followed by three years of Japanese oppressive rule, until American advances across the Pacific led to the invasion of the southern island of Leyte in October 1944.