Dura screamed and jolted fully awake. She felt herself quiver from the blow, as if someone had punched her own skull; she looked around, wild-eyed, for the source of the disaster. The pigs were squealing furiously. Hork, still at his controls, was laughing at her.

"Damn you. What was that?"

He spread his hands. "Just a little welcoming card from the Quantum Sea." He pointed. "Look out of the window."

She turned to stare through the clearwood. The Mantle here was utterly dark, but the lamps of the ship cast a green glow for a few microns through the murky, turbulent stuff. And there were forms drifting through that dim ocean — blocky, irregular shapes, many of them islands large enough to swallow up this tiny craft. The blocks slid silently upward past the ship and toward the distant Mantle — or rather, Dura realized, the "Pig" herself was hurtling down past them on her way toward the Core.

"Corestuff bergs... Islands of hyperonic matter," Hork said. "No Fisherman would tackle bergs of such a size... but then, no Fisherman has ever been so deep."

Dura stared gloomily out at the vast, slow-moving bulks of hyperonic matter. If they were unlucky enough, she realized — if they were caught by a combination of a large enough mass and an adverse current — their little ship would be crushed like a child's skull, magnetic protection or no. "How deep are we?"

Hork peered at the crude meters on his control panel; his beard scratched softly at the meters' clearwood covers. "Hard to say," he said dismissively. "Our tame experts were very clever at finding ways for us to travel so far, but not so clever at letting us know where we are. But I'd guess..." He scowled. "Perhaps five meters below the City."

Dura gasped. Five meters... Five hundred thousand mansheights. Why, surely even an Ur-human would be awed by such a journey.

"Of course, we've no real control over our position. All we've the capability to do is to descend and, if we live through that, to come up again. But we could emerge anywhere; we've no idea where these currents are taking us."

"We've discussed this problem. Wherever we emerge we need only follow the Magfield to the South Pole."

Hork smiled at her. "But that could be tens of meters from the City... It could take months to return. And then we will rely on your upfluxer survival skills to enable us to endure, in the remote wilds of the Star. I will place myself in your hands, and I anticipate that the journey home will be... interesting."

The impacts from the hyperonic bergs were coming thick and fast now. Hork pulled at the wooden levers on his control panel and slowed their progress down to a crawl; Dura watched through the windows as the thickening masses of Corestuff clustered around the "Pig," held back from crushing her only by the invisible walls of the magnetic shield.