Jacob tried to correct but overcompensated, making the waldo tumble even worse. The beating of his fins momentarily made the area around him a churning mass of bubbles, until patiently, by trial and error, he got himself righted.

He pushed off again, carefully, to get some headway, then arched his back and kicked out. The waldo responded with a great tail-slashing leap into the air.

The dolphin was almost a kilometer off. As he reached the top of his arc, Jacob saw her fall gracefully from a height of ten meters to slice smoothly into the swell below.

He pointed his helmet beak at the water and the sea came at him like a green wall. The impact made his helmet ring as he tore through tendrils of floating kelp, sending a golden Garibaldi darting away in panic as he drove downwards.

He was going in too steep. He swore and kicked twice to straighten out. The machine's massive metal flukes beat at the water to the rhythmic push of his feet, each beat sending a tremor up his spine, pressing him against the suit's heavy padding. When the time was right, he arched and kicked again. The machine ripped out of the water.