Zero laughed deliriously and splashed more water over his Long Beach Marathon T-shirt, wheezing as he struggled to catch his breath. He whacked big splashes at the wall of waiting, hovering creatures, which immediately pulled back.

The bugs that he downed flailed wildly on the pool’s surface, exuding a chemical slick. On the bottom of the pool he could see the carcasses of animals that had recently drowned.

After catching his wind, and before his muscles started to seize up, Zero submerged himself one more time and rose from the pool, sopping wet.

Then he leaped out of the water and made his final run up the far sunlit bank.

The air was fresher and the field green in the sunlight as he headed toward the blackened tracks of the XATV-9, which could still be seen on the field leading from a hole blasted into the forest edge.

He drove his body forward as the animals rushed around the edge of the pool.

He used up his lead to reach the jungle opening ten feet ahead of the frontrunners.

He plunged into the thick jungle, following the rover’s tracks.

Nightmarish shrieks and howls filled the fetid air as Zero wove around and over the tangled growth, ducking and dodging stinging darts from the trees.

He nearly ran into the trunk of a tree covered with vertical sharklike jaws spiraling up its surface. At the last moment, he dodged around it; two pursuing Henders rats struck the trunk and disappeared into snapping mouths.

He tried to stay focused and not allow himself to fall into any rhythm.

The rubber soles of his running shoes were losing their treads, dissolving off his feet. He kept moving. Somehow, as sweat evaporated from his body, it seemed like a bubble had formed around him, repelling the creatures with an invisible wall. He dodged across the shooting galleries of jungle corridors unscathed. He had no time to wonder why or how this was happening.

In the dense jungle between the corridors he veered randomly while trying to stay near the plowed tracks of the rover, until he came to an unexpected dip and lost his footing on slick mud. “Oh shit!” he muttered as he slid down a giant lavender leaf, avoiding the hooks on its surface as the leaf folded closed behind him in sections.

“Oh shit!” someone said in the trees ahead.

Zero felt a spurt of adrenaline and lunged instinctively toward the human voice.

“Oh shit, oh shit!” the voice said, and Zero realized it was his own voice. He looked up and saw a shrimpanzee hurtling out of the canopy toward him. “Oh shit, oh shit!” it said, spreading six legs wide above him.

Zero rolled under a fallen tree and then leaped up, running and dodging a fusillade of disk-ants shooting through the air like discuses toward his legs. He pole-vaulted on a yuccalike stalk that split open and tried to curl down over his hands before he let go and somersaulted under a clover-covered dead trunk that absorbed a hail of darts fired from nearby trees-except for two, which stabbed Zero’s right calf through his pants.

He ripped out the darts immediately but he could feel the leg going numb as he pulled himself to his feet and pushed on.

He had lost the rover tracks and despaired, fearing he was lost. His hands and arms were scratched and bleeding, his whole body dripping with sweat. His right leg was dragging, but he swung it forward with his right hand, crashing through the undergrowth.

He ducked and snaked awkwardly around branches and trunks. The air grew hot and more putrid. At last, he spotted the sunlit opening above where, an eternity ago, the rover had penetrated the jungle.

With a gasp, he emerged onto the slope. To his right, he saw StatLab staggered like a derailed train up the hillside.

His lungs burned, his throat wheezed, his head pounded and his eyes stung as he limped up the hill. The muscles of his right calf were seizing, barely functional. The soles were peeling from his shoes and leaking blue gel.

Heaving himself forward, he banged on the encrusted bottom of Section One.