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Pitt slowly swam in a 360-degree circle. "No, nothing."
"Can you make out details of the bottom?"
"Fairly well," replied Pitt. "The water is transparent as glass but quite dark. The scum on the surface cuts the sunlight on the bottom by seventy percent. It's a bit dark around the walls so I'll have to swim a search pattern so I won't miss the bodies."
"Do you have enough slack on the safety line?"
"Maintain a slight tension so it won't hinder my movement as I go deeper."
For the next twelve minutes Pitt circled the steep walls of the sinkhole, probing every cavity, descending as if revolving around a giant corkscrew. The limestone, laid down hundreds of millions of years earlier, was mineral stained with strange, abstract images. He planed horizontally and swam in languid slow motion, sweeping the beam of light back and forth in front of him. The illusion of soaring over a bottomless pit was overwhelming.
Finally, he leveled out over the floor of the sacrificial pool. No firm sand or plant life, just one uneven patch of ugly brown silt broken by clusters of grayish rock. "I have the bottom at slightly over thirty-six meters. Still no sign of Kelsey or Rodgers."
Far above the pool, Miller gave Giordino a dazed look. "They must be down there. Impossible for them to simply vanish."
Far below, Pitt kicked slowly across the bottom, careful to stay a good meter above the rocks and especially the silt, which might billow into a blinding cloud and reduce his visibility to zero within seconds.
Once disturbed, silt could remain suspended for several hours before settling back to the bottom. He gave an involuntary shudder. The water had turned uncomfortably cold as he passed into a cool layer suspended beneath the warmer water above. He slowed and drifted, adding enough lift from his compensator for slight buoyancy, achieving a slight head-down, fins-up swimming position.
Cautiously, he reached down and gently sank his hands into the brown muck. They touched bedrock before the silt rose to his wrists. Pitt thought it strange the silt was so shallow. After countless centuries of erosion from the walls and runoff from the ground above, the rocky subsurface should have been covered with a layer at least 2 meters (over 6 feet) deep. He went motionless and floated over what looked like a field of bleached white tree limbs sprouting from the mud. Gripping one that was gnarled with small protrusions, he eased it out of the bed of silt. He found himself staring at a spinal column from an ancient sacrificial victim.
Giordino's voice broke through his earphones. "Speak to me."
"Depth thirty-seven meters," Pitt answered as he flung aside the spinal column. "The floor of the pool is a bone yard. There must be two hundred skeletons scattered around down here."
"Still no sign of bodies?"
"Not yet."
Pitt began to feel an icy finger trail up the nape of his neck as he spotted a skeleton with a bony hand pointing into the gloom. Beside the rib cage was a rusty breastplate, while the skull was still encased in what he guessed was a sixteenth-century Spanish helmet.
Pitt reported the sighting to Giordino. "Tell Doc Miller I've found a long-dead Spaniard complete with helmet and breastplate down here." Then, as if drawn by an unseen force, his eyes followed in the direction a curled finger of the hand pointed.
There was another body, one that had died more recently. It appeared to be a male with the legs drawn up and the head tilted back. Decomposition had not had time to fully break down the flesh. The corpse was still in a state of saponification, where the meaty tissue and organs had turned into a firm soaplike substance.
The expensive hiking boots, a red silk scarf knotted around the neck, and a Navajo silver belt buckle inlaid with turquoise stones made it easy for Pitt to recognize someone who was not a local peasant.
Whoever he was, he was not young. Strands of long silver hair and beard swayed with the current from Pitt's movements. A wide gash in the neck also showed how he had died.
A thick gold ring with a large yellow stone flashed under the beam of the dive light. The thought occurred to Pitt that the ring might come in handy for identifying the body. Fighting the bile rising in his throat, he easily pulled the ring over the knuckle of the dead man's rotting finger while half expecting a shadowy form to appear and accuse him of acting like a ghoul. Disagreeable as the job was, he swished the ring through the silt to clean off any remnant of its former owner, and then slipped it onto one of his own fingers so he wouldn't lose it.
"I have another one," he notified Giordino.
"One of the divers or an old Spaniard?"
"Neither. This one looks to be a few months to a year old."
Do you want to retrieve it?" asked Giordino.
"Not yet. We'll wait until after we find Doc Miller's people-" Pitt suddenly broke off as he was struck by an enormous force of water that surged into the pool from an unseen passage on the opposite wall and churned up the silt like dust whirling around a tornado. He would have tumbled out of control like a leaf in the wind by the unexpected energy of the turbulence but for his safety line. As it was he barely kept a firm grip on his dive light.
"That was a hell of a jerk," said Giordino with concern. "What's going on?"
"I've been struck by a powerful surge from nowhere," Pitt replied, relaxing and allowing himself to go with the flow. "That explains why the silt layer is so shallow. It's periodically swept away by the turbulence."
"Probably fed by an underground water system that builds up pressure and releases it as a surge across the floor of the sinkhole," Giordino speculated. "Shall we pull you out?"
"No, leave me be. Visibility is nil, but I don't seem to be in any immediate danger. Slowly release the safety line and let's see where the current carries me. There must be an outlet somewhere."
