Villanueva, now suited back into his coveralls, helped her unhook from the bridge. His hand shook a bit as he helped her stand. Whether from the cold of the water or from the aftershock of such a narrow escape, she couldn't tell.

"Thanks," he said quickly, an embarrassed look in his eyes. "I owe you."

She tried to answer, but he turned his back to her and returned his attention to Michaelson, the last in line, as he crossed over the river.

As soon as the major had set his boots on the rocky edge, Ashley called everyone together. "This section of the cavern is much smaller, so we'll explore this area as a group. Let's head out. Keep your eyes and ears open. Whatever caused those screams may still be out there."

This search is futile, Khalid thought. He dug black mud from under a fingernail with a small blade. Halloway had to be dead. When would these damned idiots realize it so they could move on?

He watched the SEAL examine the wormhole they had discovered. No trace of the missing teammate had been found. They had searched behind every pebble and down every black crack. Nothing.

"This is no use," Villanueva said as he shined his flashlight down the wormhole. "No one's been through this hole in years. Look at the layer of mud at the entrance. No footprints or sled marks."

Ashley crouched at his side and pushed a finger knuckle-deep into the mud. "You're right. If anyone had passed, there would be some sign." She pushed back up and faced the team. "There's got to be another exit we missed."

"Maybe," Khalid said, trying to wake the team up, to get them redirected to the mission at hand. He had an agenda to follow, whether Halloway was found or not. "Maybe he got caught in the river and was washed away."

Michaelson shook his head. "No. The scream was well beyond the river's edge. I agree with Ashley. There must be another exit."

Khalid hid a scowl.

"Before we leave here," Ashley said, "I think we should send someone down this wormhole. Just to make sure. Any volunteers?"

Villanueva pulled out his sled. "I'll go."

She nodded. "Be careful. Just check out where this exits and come right back. No solo venturing."

He nodded and slipped into the hole. Ashley checked her watch.

Rolling his eyes at another delay, Khalid walked over to where Linda sat on a rock. She had her arms wrapped tight around her chest as he sat down beside her.

"Do you think we'll find him?" she asked, her voice tiny.

"No. No matter what the major believes, I think he was washed away."

Linda shuddered. He could tell what she was thinking. The fin had been as white as the belly of a maggot. Like some ghost shark coming to claim their souls. Men and rock he could handle, but the creatures down here… first the squid trying to gnaw his arm off and now this monster… The sight of that fin had made his flesh crawl. As if Nature were showing them how small they were.

He remembered, as a boy, hearing about the sandstorm that had buried his mother's camp in Syria, killing everyone. The black hand of Allah, they had called it, but he knew better. It was just Nature, an indifferent god, oblivious to the plans of man. To her savagery, everyone was vulnerable. And Khalid hated feeling vulnerable.

Linda hugged herself and kept staring back at the river. "That albino shark. It was huge. To support such a predator, the aquatic ecosystem down here must be more extensive than anyone had imagined. If it weren't for Halloway, I wouldn't mind stopping and doing some tests."

Khalid scowled, rubbing at his arm where the ammonite had bit him. "I'd rather avoid that ecosystem myself and stick to dry land."

"I found something!" Ben called from several yards away.

Khalid craned his neck to stare over at Ben. He stood by the cavern wall with a match in his hand.

Ashley called to him. "What is it, Ben?"

"I found another passage out of here."

Who was he kidding? Ashley thought, eyeing the narrow crack, buried in the shadowed fold of the rock face? It extended from floor to ceiling, but gapped only a foot wide. Easy to miss. "Nobody could fit through there," she said. "It's too narrow."

"No, I measured it," Ben said.

"With what?"

"My boot."

She gave him a blank stare.

"It's a caver's rule of thumb. 'If it's wider than your boot, through there one can scoot.'"

"I don't think so. Especially Halloway. He's a big guy."

"It would be a tight squeeze, but I know he could've fit."

"Besides, who knows if there's anything on the other side?"

In answer, Ben held up a lighted match to the crack. The flame bent away from the opening. "Wind," he said. "There's a breeze blowing from beyond there."

Ashley watched the flame flicker. Perhaps…

A scraping from the wormhole behind her drew her attention away. A pair of legs slid backward out of the opening. It was Villanueva. He stood up, wiping his hands on his knees.

"It's blocked," he said, huffing a bit. "There's a rock-fall blocking the passage about thirty yards in. I had a hell of a time backing all the way up here."

Ashley swore. If it was blocked, then there was only one other way to proceed forward.

Linda stepped up and peeked into the narrow slit. "But would Halloway have gone this way?" She seemed to eye the crack with fear. "I mean, why would he even cross the river?"

Villanueva answered, "If something attacked him. Something he couldn't handle. He would try to lead it away. Keep it from surprising us like it did him."

"Why do you think that?" Ashley asked.

Villanueva met her eyes. "It's what I would have done."

Ashley chewed at her lip. "So what do you suggest we do?"

"He's trying to buy us time to escape. I say we use it."

She closed her eyes, hating the thought of abandoning him.

Ben called from where he had edged into the crack, exploring the passage. "Come see this!"

As Ashley approached Ben, he reached a hand toward her from the narrow slit. His palm was covered in blood. Fresh blood.

"He's been this way," Ashley muttered. "Just recently." She turned back to Villanueva. "So do you think we should still go back?"

His jaw muscles tightened. "You're the leader."

Ben climbed from the slit. "So who's going through first? We should hurry."

Ashley sighed. Obviously Ben had been deaf to their discussion. "It's more complicated than that."

"What? We're right behind him."

"Villanueva thinks Halloway might be trying to draw something away from us."

Ben's voice rose in anger. "Or maybe he's just bloody hurt! Seeking shelter." He grabbed her shoulder. "Ash, I swear he's just ahead of us. We can't leave him."

She rubbed at her tired eyes, then nodded. "Okay. Let's go."

Linda stood in her underwear, shivering by the wall. She had shed her backpack and even her coveralls. Less to snag and catch, Ben had said. Narrows the profile. She shuddered. How could she possibly wedge her body into that slit? The walls would squeeze the breath from her chest.

They waited for Ben to report on his reconnaissance of the crack. He had squished into the black rock over three minutes ago. Ashley and Michaelson stood as sentries to either side as he reported his progress.

"I'm through," he called, his voice echoing into their cavern. "The passage is only six feet long, then it abruptly widens into a decent-sized tunnel. It's a piece of cake. Only one doozy of a tight spot just near the end."

Ashley faced the group. "I'm gonna send Villanueva next. He's the widest of all of us. If he can make it through, then we all can."

No one argued.

Linda held her breath, hoping the SEAL would fail; then she wouldn't have to face the crush of those walls. Her heart sank when she heard Ben's cheer.

"He's through! Scraped his chest a bit, but no harm done."