"We're not going to make it," Blakely yelled, each word louder than the last.

The note of panic in his voice was contagious. Jason's studied paddling grew frantic. He concentrated on the water he was churning. Still he kept listening, blood pounding in his ears, expecting to hear at any moment the rip of shredded pontoon.

His shoulders burned with the strain, but he kept digging with his paddle.

"We're turning!" Blakely's voice had an edge of hope.

Jason glanced over his shoulder. The boat was now running at an angle toward the wall, rather than straight. He continued pulling with his paddle. "Get the motor started!" he yelled.

"Not enough time. I don't dare let go of the rudder."

Jason had been on enough canoe trips to know that they weren't going to make it. Still he wrestled with his paddle. Then, through the smoke ahead, an opening appeared in the wall as their boat angled to the side. A wide black mouth. If they could aim for that, maybe they could miss the jagged wall.

Blakely saw it too. "It's our only chance."

Jason dug savagely. Luckily, the current aimed for the hole too. As he worked the paddle, the prow of the boat crept deeper into the current.

"Watch your head!" Blakely called out.

Jason ducked as a shelf of rocky overhang passed over the boat. They were about to hit the wall! He crouched low in the boat, anticipating the collision. But the strength of the flow suddenly grabbed the boat and pulled the prow around the bend and into the black tunnel.

"We did it," Jason said.

They glided smoothly into the tunnel. Jason crawled forward to the light at the prow. He swiveled it about, examining the walls. No rocky spars awaited to jab them. Instead the walls were glassy smooth.

"It looks safe," Blakely said. "This is the river that drains the lake. Luckily for us, the years of running water have polished these walls." His words echoed, giving them a hollow feeling.

The river carried the boat deeper into the tunnel. The light pierced the tunnel to a bend ahead. "Where does it go?" Jason asked.

"I don't know, and I don't think this is a good time to explore. Let's see if we can swing the boat around, and I'll get the motor running."

Jason passed Blakely a paddle and each took a side. Jason paddled forward while the doctor backpaddled. The boat began to turn on its axis just as the current passed around a bend in the tunnel. The river beyond the curve suddenly dropped at a steep slope. The increased speed of the flow ripped the prow of the boat forward again.

"Hang on, Jason!" Blakely said, as the boat was dragged toward the racing waters.

Jason swallowed hard, winding one hand into a rope handle. The boat plunged into the trough, accelerating rapidly. The prow's light bobbed across the churning waters. The sight ahead caused Jason to wrap a second hand into the rope.

The tunnel curved around a tight bend. The river swung in an arc up the side of the wall as it coursed around the turn, tilted at an impossible angle.

"Shit!" Blakely blurted, quickly wiping spray off of his glasses with the cuff of his shirt, then frantically grabbing his handle.

The boat shot into the curve, climbing high on the wall as they made the turn. Like riding some water slide down a sewer drain, Jason thought. He watched as Blakely's side of the boat tilted up over his head. The doctor struggled to maintain his seat, legs scrambling on the slick rubber floor. Jason cringed, praying the boat wouldn't flip.

Then the boat slammed back down as the corner straightened out, throwing Jason to the floor.

"Another turn!" Blakely yelled.

Jason braced for it. This time his side of the boat was thrown high. He saw the bald spot that crowned the doctor's head. Then the boat leveled again. "How do we stop?"

Blakely squinted at the tunnel ahead as the boat raced past the walls. "I don't know. Just hope that eventually it levels out so we can slow down… Hang on! Here comes another turn!"

After five more turns, Jason's stomach began to get queasy. The dry rations he had eaten for breakfast felt like a gnarled lump in his stomach. "I'm going to be sick," he mumbled.

"Shhh!" Blakely said. "Listen." The boat had slowed somewhat, the river leveling out, but the current was still strong.

Restraining a groan, he cocked an ear. Now what? Then he heard it too. It sounded like someone gargling. It swelled louder and louder until it was thunderous.

Blakely said the next word as if it hurt his mouth. "Waterfall." He grabbed the rudder. "We've got to turn around and get the motor going!"

Jason looked at the rocky tube tight around them. No room to turn, even ignoring the torrent of water. Then he remembered something his mother had taught him. "Spin in the next curve!" he yelled above the thunder.

"What?" Blakely looked at him as if he might be insane.

"As we turn, the force of the water can help spin us."

"That's too dangerous."

Jason pointed ahead. "Yeah, but what about that?"

"Good point. How do we spin?"

Jason pantomimed frantically while trying to explain, "Lean the rudder in the opposite direction of the next turn. Force the prow up the wall. The current will whip the stern around. Spinning us backward. My mom and I tried it once."

"Did it work?"

"Well, no. We flipped the boat."

"Great."

"It's supposed to work. We just did it wrong."

"Well, we have only one chance to do this right. There's the next corner!" Blakely had to holler to be heard above the roar.

Jason scooted back beside Blakely, ready to add his weight to the rudder. "Push when I say!" he shouted.

The doctor nodded.

Jason waited until the tip of the boat entered the curve. "Now!"

Blakely shoved the rudder, leaning hard on it. Jason pushed too. The prow shot up the wall, tilting the boat vertical.

"Don't let up!" Jason yelled, sensing that the doctor was beginning to ease up on the rudder. "Not till we're around!"

The boat shuddered for a heartbeat, then the stern of the boat flipped around, the light pointing back the way they had come.

"My god!" Blakely said, wide-eyed. "We did it."

Jason swung around to check where the current was still dragging them. A hundred yards farther, the river emptied into a large cavern. He squinted his eyes at the approaching hole. That's weird, he thought. He rubbed his eyes, glancing at the tunnel walls around him. It didn't go away. "Look, there's some sort of light coming from the walls here."

Blakely craned his neck to see. "Some sort of glowing mold." He pulled on the motor's starter cord. The engine click-clacked but died.

"Uh-oh!" Jason said. "Look!"

Blakely had already seen it and yanked frantically on the cord.

Downcurrent, the glow revealed a whitewater turmoil. The roar now pressed on the eardrums, rattling inside his skull. The river disappeared beyond the churning water. Over a cliff!

Jason turned to the doctor as the boat raced toward the plummet. "Hurry!"

With a fierce pull, the engine sputtered-then caught! Blakely twisted the throttle wide open. The motor fought the current. At first, there was no effect. The current still pushed the boat toward the waterfall. But finally, only yards from the whitewater, the engine started winning. The boat now sat still in the river, engine struggling with the current.

"C'mon, c'mon, c'mon…" Jason willed the boat forward.

As if the boat heard him, it inched forward, at first slowly, then faster and faster.

Jason whooped. Blakely wore a fierce smile.

Until the engine died.