There was no way to avoid it. Birdie had crouched in the bottom of the boat, clutching the bottom boards with white-knuckled hands.

The boat’s prow tilted up. Thirty degrees, forty-five, sixty. Horizontal and vertical switched roles. Birdie found himself with his feet braced on the boat’s stern, his hands holding tight to the centerboard and the little mast. He was lifted, with a two- or three-gee force on his body that went on and on, like a launch from Starside Port to orbit. Rushing water flew past, spray two feet from his nose. For half a minute he was carried up and up, a flyspeck on a wall of ocean, up into Opal’s dark clouds. He poised there, forever, unable to see anything as the boat leveled off. At last came the fall, leaving his stomach behind on the downward plunge.

He had been permitted one breathtaking view as they dropped out of the clouds: Opal’s seabed lay ahead, exposed by millennial tides, dotted with long-sunken ships and the vast green bodies of stranded Dowsers, unbuoyed by water and crushed by their own multimillion-ton weight. Then he was swooping down a long, foam-flecked slope, toward that muddy wasteland. He knew, even more certainly than before, that he was about to die.

A second, smaller wave, running crosswise to the first, saved him. Before he could be smashed onto the unforgiving seabed, there was a scream of wind and a harsh slap on the boat’s rugged stern. He found himself being lifted again in a boiling torrent of warm spray, holding harder than ever, almost unable to breathe. But breathe he did, and held on, too, an hour longer than he would have believed humanly possible, until Summertide was past and the tough little boat had been tossed to calmer waters.

It was something to tell his grandchildren about — if he ever got around to having any.

He had not intended to, but now he might. Only weeks after Summertide, and the social pressure was already on. Every fertile woman would be pregnant within the next month, pushing Opal’s population back toward survival level.