"Christ, what do you want from me? I'm not an oceanographer." Seger waves an exasperated hand at the modelers. "Ask them. Jason's been running that model for—"

"Semen-sucking-motherfucking stumpfucker!" Jason snarls at the screen. The screen snarls back:

Failure to converge. Confidence limits exceeded.

Further predictions unreliable.

Rowan closes her eyes and starts again. "Would it be able to survive in the euphotic zone, at least? It's warmer up there, even in winter. Could our recon parties have picked it up and brought it back?"

"Then it would be showing up here, not way over at Impossible Lake."

"But it shouldn't be showing up anywh—"

"What about fish?" Lubin says suddenly.

Rowan looks at him. "What?"

"ßehemoth can survive indefinitely inside a host, correct? Less osmotic stress. That's why they infect fish in the first place. Perhaps they hitched a ride."

Cavalry

"Abyssal fish don't disperse," Seger says. "They just hang around the vents."

"Are the larvae planktonic?"

"Still wouldn't work. Not over these kinds of distances, anyway."

"With all due respect," Lubin remarks, "you're a medical doctor. Maybe we should ask someone with relevant expertise."

It's a jab, of course. When the corpses were assigning professional berths on the ark, ichthyologists didn't even make the long list. But Seger only shakes her head impatiently. "They'd tell you the same thing."

"How do you know?" There's an odd curiosity in Rowan's voice.

"Because ßehemoth was trapped in a few hot vents for most of Earth's history. If it had been able to disperse inside plankton, why wait until now to take over the world? It would have done it a few hundred million years ago."

Something changes in Patricia Rowan. Clarke can't quite put her finger on it. Maybe it's some subtle shift in the other woman's posture. Or perhaps Rowan's ConTacts have brightened, as if the intel twinkling across her eyes has slipped into fast-forward.

"Pat?" Clarke asks.

But suddenly Seger's coming out of her chair like it was on fire, spurred by a signal coming over her earbud. She taps her watch to bring it online: "I'm on my way. Stall them."

She turns to Lubin and Clarke. "If you really want to help, come with me."

"What's the problem?" Lubin asks.

Seger's already halfway across the cave. "More slow learners. They're about to kill your friend."

Cavalry

There are lines drawn everywhere in Atlantis, four-centimeter gaps that circumscribe whole corridors as if someone had chainsawed right through the bulkheads at regular intervals. The gaps are flagged by cautionary bands of diagonal striping to either side, and if you stand astride one of them and look up to where it passes overhead, you'll see why: each contains a dropgate, poised to guillotine down in the event of a hull breach. They're such convenient and ubiquitous boundaries that parties in opposition have always tended to use them as lines in the sand.