Austin pushed himself out of the water as high as he could go, reached up, and grabbed Lee by the front of her blouse and pulled her back down with him. She tumbled over the gunwale into the canal just seconds before Chang’s bullets ripped into the boat, sending up a shower of fiberglass splinters.

Lee’s additional weight dragged them both down several feet. Austin then expelled air from his buoyancy compensator and they sank even deeper. He put one arm around her waist, as if leading her through a waltz step, and with his free hand pointed the flashlight at his face. She had reflexively taken a gulp of air before hitting the water but now had used up her supply and was flailing in panic. Austin released her, took a deep breath, then removed the regulator from his mouth and pointed to the bubbles streaming from the mouthpiece.

Lee’s eyes were wide with fright, but she understood what Austin was trying to convey. She took the mouthpiece and clamped it between her teeth. As she filled her lungs, the panic in her eyes subsided. She then passed the mouthpiece back to Austin.

Buddy-breathing would keep them alive, but there was still Chang and his men to deal with. This became abundantly clear when Austin saw a foamy splash in the water, then another. Chang’s men were diving off the boat.

The men easily could have tracked Austin and Lee in the shallow waters of the canal by following their air bubbles on the surface. Eventually, Chang might get lucky, or he simply could wait until the two used up their air supply. But he was impatient.

Austin drew air into his lungs, passed the mouthpiece back to Lee, and pointed with his index finger.

This way.

Taking Lee by the hand, he swam deeper, toward the entrance of the temple enclosure. Chang’s men were at a disadvantage without air and were quickly outdistanced. By the time their prey vanished through the temple wall, the men were swimming back to the surface. Chang’s boat moved back and forth, searching for telltale bubbles. Not seeing any, Chang assumed that his targets had slipped past him. He ordered that the inflatable move farther out into the canal. By then, Austin and Lee were inside the temple.

Lee was buddy-breathing like a pro, but she almost gulped down a mouthful of water when Austin showed her the wall carvings. Like Austin, she too put her hand on the jellyfish. She shook her head in frustration at not being able to talk. Austin pointed to the camera clipped to his vest and signaled OK with his thumb and index finger.