Farr put his shoulders to the circular hatch and pushed. It was heavy and stiff, and as he pushed he heard the scraping of the Corestuff hoops binding up the capsule as they slid away.

The hatch burst open, flying out of his reach. The Air outside the Bell was thick and glutinous, and it crowded into the cabin, overwhelming the thinner, clear Air within. The light of the cabin's lamps seemed immediately dimmed.

Farr held his breath, his mouth clamped closed almost of its own accord. There was a pressure on his chest, as if the thicker Air were trying to force itself into his lungs through his skin. With an effort of will he dragged his lips apart. The cloying, purple Air forced its way into his throat; he could feel it on his lips, viscous and bitter. He heaved, expanding his lungs; the stuff burned as it worked through his capillaries.

So, after a brief few heartbeats of struggle, he was embedded in the underMantle. He raised his arms experimentally, flexing his fingers. His movements were unimpaired, but he felt weaker, sluggish. Perhaps the superfluid fraction of this Air was lower than in the true Mantle.

"The hatch," Bzya said, pointing. "You'd better retrieve it." Bzya's voice was obscured, as if he was speaking through a layer of cloth.

Farr nodded. He pushed his way out of the hatchway.

The yellow-purple Air was so thick it barely carried any illumination; it was as if he was suspended in a dark-walled bubble about four mansheights across. The Bell was suspended at the center of the bubble, a drifting bulk. Beyond it the Spine was a wall, massive and implacable, its upper and lower extremes lost in the misty obscurity of the Air. Looking at the Spine now Farr could see cables of Corestuff wrapped around it and laid out along its length — cables which must provide a magnetic field like the Bell's, to keep the Spine from itself dissolving in the lower underMantle. The Bell's own cables snaked up and out of sight toward the world of the upperMantle, a world which seemed impossibly distant to Farr.

The loose hatch was a short distance from him. He Waved to it easily enough, although the Air in which he was embedded was a cloying presence around him. He caught the hatch and returned it briskly to Bzya.

"Now the berg," Hosch called. "Can you see it?"

Farr looked. There was a shape, lumpen, lodged between the Bell and the Spine. It was half a mansheight long, dark and irregular, like a growth on the clean, artificial lines of the Bell.

"Don't I need the ropes?"

"Go and inspect the berg first," Hosch called. "See if it's done us any damage."

He took deep breaths of the stale Air and flexed his legs. It would take only a few strokes to Wave to the lump of Corestuff.