She steps around them and checks out the hab's comm board. It's a pretty sparse setup, just a few off-the-shelf components to keep it in the loop. Clarke plays with the sonar display, pans across the topography of the Ridge and the rash of Platonic icons laid upon it. Here are the main generators, wireframe skyscrapers looming over the ridge to the south. Here's Atlantis, a great lumpy ferris wheel laid on its side—fuzzy and unfocussed now, the echo smeared by a half-dozen white-noise generators started up to keep prying ears from listening in on the recent deliberations. Nobody's used those generators since the Revolt. Clarke was surprised that they were even still in place, much less in working order.

She wonders if someone's taken an active hand in extending the warranty.

A sprinkling of silver bubbles dusts the display: all the semi-abandoned homes of those who hardly know the meaning of the word. She can actually see those people if she cranks up the rez: the display loses range but gains detail, and the local sea-space fills with shimmering sapphire icons as translucent as cave fish. Their implants bounce hard reflective echoes from within the flesh, little opaque organ-clusters of machinery.

It's simple enough to label the creatures on the screen—each contains an ID-transponder next to the heart, for easy identification. There's a whole layer of intelligence that Clarke can access with a single touch. She doesn't, as a rule. Nobody does. Rifter society has its own odd etiquette. Besides, it usually isn't necessary. Over the years you learn to read the raw echoes. Creasy's implants put out a bit of fuzz on the dorsal aspect; Yeager's bum leg lists him slightly to port when he moves. Gomez's massive bulk would be a giveaway even to a dryback. The transponders are an intrusive redundancy, a cheat sheet for novices. Rifters generally have no use for such telemetry; corpses, these days, have no access to it.

Occasionally, though—when distance bleeds any useful telltales from an echo, or when the target itself has changed—cheat sheets are the only option.

Clarke slides the range to maximum: the hard bright shapes fall together, shrinking into the center of the display like cosmic flotsam sucked towards a black hole. Other topography creeps into range around the outer edges of the screen, vast and dim and fractal. Great dark fissures race into view, splitting and criss-crossing the substrate. A dozen rough mounds of vomited zinc-and-silver precipitate litter the bottom, some barely a meter high, one fifty times that size. The very seafloor bends up to the east. The shoulders of great mountains loom just out of range.

Occasional smudges of blue light drift in the middle distance, and further. Some pixellate slow meandering courses across a muddy plain; others merely drift. There's no chance of a usable profile at such distances, but neither is there any need. The transponder overlay is definitive.