The squids drag them higher. By now there's a definite gradient, light above fading to darkness below. To Clarke this is the scariest part of the ocean, the half-lit midwater depths where real squid roam: boneless tentacled monsters thirty meters long, their brains as cold and quick as superconductors. They're twice as large as they used to be, she's been told. Five times more abundant. Apparently it all comes down to better day care. Architeuthis larvae grow faster in the warming seas, their numbers unconstrained by predators long since fished out of existence.

She's never actually seen one, of course. Hopefully she never will—according to the sims the population is crashing for want of prey, and the ocean's vast enough to keep the chances of a random encounter astronomically remote anyway. But occasionally the drones catch ghostly echoes from massive objects passing overhead: hard shouts of chitin and cartilage, faint landscapes of surrounding flesh that sonar barely sees at all. Fortunately, Archie rarely descends into true darkness.

The ambient hue intensifies as they rise—colors don't survive photoamplification in dim light, but this close to the surface the difference between capped and naked eyes is supposed to be minimal. Sometimes Clarke has an impulse to put that to the test, pop the caps right out of her eyes and see for herself, but it's an impossible dream. The diveskin wraps around her face and bonds directly to the photocollagen. She can't even blink.

Surge, now. Overhead, the skin of the ocean writhes like dim mercury. It tilts and dips and scrolls past in an endless succession of crests and troughs, twisting a cool orb glowing on the other side, tying it into playful dancing knots. A few moments later they break through the surface and look onto a world of sea and moonlit sky.

They are still alive. A three-thousand-meter free ascent in the space of forty minutes, and not so much as a burst capillary. Clarke swallows against the isotonic saline in throat and sinuses, feels the machinery sparking in her chest, and marvels again at the wonder of a breathless existence.

Lubin's all business, of course. He's maxed his squid's buoyancy and is using it as a floating platform for the receiver. Clarke sets her own squid to station-keeping and helps him set up.

They slide up and down silver swells, the moon bright enough to render their eyecaps redundant. The unpacked antennae cluster bobs on its tether, eyes and ears jostling in every direction, tracking satellites, compensating for the motion of the waves. One or two low-tech wireframes scan for ground stations.

Too slowly, signals accumulate.

The broth gets thinner with each survey. Oh, the ether's still full of information—the little histograms are creeping up all the way into the centimeter band, there's chatter along the whole spectrum—but density's way down.

Of course, even the loss of signal carries its own ominous intelligence.

"Not much out there," Clarke remarks, nodding at the readouts.