When Pitt had first spotted the Sea Splendour, the cruise ship he had saved in Chile, he thought he might use her to block the entrance to the locks. But the Santa Rita was already positioned there, leaving no room for the cruise ship to intrude. His backup plan was much more audacious, if not foolhardy. If he couldn’t block the Santa Rita from entering the locks, then he’d prevent her from leaving them. From the confines of Miraflores Lake, there was only one way to do that.

Shoving the barge ahead, he guided it toward the locks, then veered south, following the fork in the waterway. Rather than aiming for the locks, the tug and barge were now headed for the adjacent dam. Pitt noticed the shadow of the massive cruise ship as it thundered alongside him.

“Sea Splendour ready when you are,” the radio crackled.

“Roger, Sea Splendour. I’ll guide you in.”

He eased the tug away from the barge and then directed the cruise ship into his place. Matching speed, the cruise ship, its high bow brushing against the barge’s stern, maintained headway.

“Looking good, Splendour,” Pitt said. “Give it all you’ve got.”

Nudging against the barge, the cruise ship briefly applied full power. It was a short burst, but enough to send the barge racing through the water.

Pitt tried to keep pace in the tug, watching the dam loom closer until it was barely a hundred yards away. “Reverse engines,” Pitt radioed. “Thanks, Sea Splendour, I’ll take it from here.”

“Good luck to you, Mr. Pitt,” Franco said.

Pressing the tug to full power, he caught up to the barge’s stern as the cruise ship dug in to reverse course.

The loaded barge was like a runaway freight train, with the tug simply maintaining its momentum. Pitt bumped its stern quarter, keeping it aligned as it raced toward the middle of the concrete dam. The barge closed quickly, charging dead center into the spillway.

Pitt braced himself for the impact, which came harder than he anticipated. The flat prow of the barge slammed into the spillway with a metallic thud—and stopped cold. The tug bounced off the barge’s stern, and Pitt went flying over the helm. Staggering back to the wheel, he turned the tug away, and considered his failed attempt to burst open a dam that had stood since 1914. He had succeeded in only wedging a barge into its century-old spillway.

Then a deep rumble sounded from below. Several feet beneath the waterline, the barge had fractured the dam facing. The fracture grew as the pressure of the lake’s water forced its way into the fissure. With a sudden buckle and roar, a fifty-foot section of the dam wall disintegrated, leading the way for the collapse of the entire dam.