“You only have one working set of the tri-mix back here,” she yelled. “Looks like I’ll be going it alone.” She didn’t relish the idea of diving without a buddy, especially since that was one of the reasons she was so mad at Simon.

“If only one of us can go, it should be me,” Blaine called back to her. She wasn’t sure if his reaction was chivalry or South American machismo, but it didn’t matter to her which it was. There was no way she would hang out on the surface.

“No chance. Simon’s my responsibility.”

Thankfully, Blaine quit arguing. She shucked her land clothes and pulled on the wet suit. When she was suited up, she moved forward to stand beside him so that she could see where they were headed. “Is it far?”

Blaine shook his head. “About ten minutes for this boat. We should be able to see the rig as soon as we curve around that spit of land there.” He pointed at a large rock outcropping that sheltered San Gabriel’s harbor. “Then we head straight on. If Simon isn’t down, he’ll probably be able to see us.”

And what then? she thought. If he saw her would that make him stop and wait?

Not Simon. He’d hurry up and dive. If she was going to stop him, she’d have to follow him down and get him to surface.

Piece of cake.

Underwater communication was so very easy, she thought sarcastically, especially with the paltry array of hand signals used by divers. A big O made with the thumb and index finger for “I’m okay.” A slashing palm over the neck for “Out of air.” Thumbs-up for “Let’s surface.” Crawling fingers for “Critter around.” Or her favorite, a vertical open palm cutting the water to indicate a reallybig critter around. As in, “Watch your butt or you’ll be some prehistoric creature’s breakfast.”

Blaine cut the boat hard, steering around a coral reef she saw only in the boat’s wake, then moved back on course for the point of the small peninsula ahead. It was obvious that he knew these waters extremely well. After a few more seconds, the boat was out far enough that Peta could see the small drilling rig and make out the shape of a boat tied up to it.

“I see his boat.”

“Yes,” Blaine said. He looked back at her. “One person topside. Simon must be down already.”

“Shit.”

The closer they got to Oilstar’s exploration platform, the more ominous it looked. No one moved on the skeletal structure, and the small main cabin’s windows were shattered, smashed—Peta guessed—by locals cruising by and taking potshots for their momentary amusement.

She looked at the boat they were chasing. Simon’s pilot, probably some local he’d hired for the day, stood up and calmly watched their progress.

Peta checked her watch. Simon could have been down five minutes, maybe ten. Depending on depth, he was good for another fifteen or twenty minutes. Add one screwup—something to make him breathe too hard, not shift his mixture right, get snagged on a rock—and it could all go wrong fast.

She pulled on her fins and strapped a rusty old dive knife to her leg. It looked like a relic that hadn’t cut anything other than stray fishing tackle since the American invasion of Grenada. Grabbing a face mask, she spat into the lens and smeared the slick liquid around before dangling the mask in the water. Funny, she thought. Who knew why spit defogged a mask?

She dug out a weight belt and slipped on twelve pounds. It was more than she’d use normally, but with 120 feet to the seabed and who knew how much deeper into the cave, she had to be sure of getting down fast and staying there.

The boat bumped. Peta bounced out of her seat.

“Sorry. Getting choppy. The sea can turn nasty quickly out here.” Blaine didn’t look particularly perturbed.

Peta clamped the belt tight and looked up to see him pull alongside the other boat.

“How long has he been down?” the Venezuelan shouted.

The Trini in Simon’s boat shrugged, exposing the bottle of Red Stripe he’d been hiding behind his leg. “Dunno,” he said sleepily in a thick accent. “Five minutes, maybe. Maybe more.”

Peta stood up. It made little difference. However long he’d been down there was too long, and discussing it wouldn’t make it any shorter. She double-checked her gear and assured herself she was good to go. Pulling on the buoyancy vest with the double tanks, she strapped it tightly to her back with twin wide Velcro straps. The tanks were heavy; she cinched them a little tighter, and gave the vest a shot of air. Then she pulled the mask down, popped in the regulator mouthpiece, and made a big O with her right index finger and thumb.

“Good luck!” Blaine shouted.

Without missing a beat, she sat on the edge of the boat, facing into it before she slowly tilted backward, flying head over heels into the water.

After the amusement-park fall into the water, Peta quickly oriented herself, dumped the air out of her vest, and turned facedown, away from the light and the path of her ascending bubbles. She kicked smoothly, straight toward the bottom. With the press of a button she started the timer function of her dive watch, then looked at it to make sure the seconds were ticking down.

While she was traveling to the bottom, she kept her air mix heavier on oxygen than she would have it when she entered the cave. She’d have to check depth and cut back the oxygen to something around a 15 or 16 percent mixture—quickly. If she took too long to do that, the excess oxygen would turn toxic in her bloodstream.

To get her mind off the dangers of the dive itself, she focused on how to find Brousseau. It occurred to her that the oil rig team had probably planted markers when they got to the bottom, showing the direction to the cave. A rip current could play havoc with marking poles, but if they were still there, she could follow them straight to the deep hole…and Simon.

The light began to fade, and with it the colors. Everything settled into a murky gloom. She took a quick glance at her depth gauge. Sixty feet. It would soon be time to turn on the headlight. She checked her time…passing three minutes into the dive. She was tempted to push it, kick a bit harder, but she resisted. It wasn’t just a question of speed. She knew she could swim faster than Simon. The problem was, if she did push herself, the exertion might make her breathe too fast. If she did that, the oxygen-nitrogen mix would be wrong no matter how she tried to balance it, which would makeher the one in need of saving.

That was another danger she didn’t need to focus on.

Her depth gauge was nearing one hundred feet, the edge of the recreational dive limit, when she saw something dark ahead of her.

She reminded herself that this was no rec dive.

Thinking, hoping, that the dark shape was the first outcropping of the sea floor, she turned on her light. Its pale glow caught the floating soup of “snow” in the water, making the tiny falling debris shine around her like fireflies.

Ahead of her, the shape moved, closer than she’d thought. The blackish grayness changed, and she saw her light reflected against white teeth. She thought of the hand symbol: making a fin with your hand to warn other divers.

Except there were no other divers down here. Nothing alive here at all except for her—and the shark seemed to have noticed that fact.

24

The few things Peta knew about sharks rushed into her mind, like life preservers bobbing to the surface after a wreck. The most relevant thing she remembered was that most sharks didn’t want to have anything to do with mankind—or womankind. Even the supposed man-eaters, the great whites, the tigers, and worst of all a rogue hammerhead separated from its pack, dined infrequently on humans.

Eyes locked on the shadowy form of the shark as it grew larger, Peta kicked back. She knew she was sucking her air mixture too heavily. Nitrogen would start building up. That’s not a good thing, she told herself, but there was this bigger problem….