And everywhere south of Harmakhis-Reull, in the ragged ejecta hills behind the rim of the basin, there were dowsing crews, out looking for aquifers. As in the roofed canyons, most of these crews had been born on Mars, and a lot of them had been born on Mars since ‘61. And they were different, profoundly different, sharing interests and enthusiasms perfectly incommunicable to any other generation, as if genetic drift or disruptive selection had produced a bimodal distribution, so that members of the old Homo sapiens were now coinhabiting the planet with a new Homo ares, creatures tall and slender and graceful and utterly at home, chattering to each other in a profound self-absorption as they did the work that would make Hellas Basin into a sea.

And this gigantic project was perfectly natural work to them. At one stop on the piste Maya and Diana got out and drove with some friends of Diana’s out onto one of the ridges of the Zea Dorsa, which ran out onto the southeast quarter of the basin floor. Now most of these dorsa were peninsulas running out under another ice lobe, and Maya looked down at the crevasse-riven glaciers to each side and tried to imagine a time when the surface of the sea would in fact lie hundreds of meters overhead, so that these craggy old basalt ridges would be nothing but blips on some ship’s sonar, home to starfish and shrimp and krill and extensive varieties of engineered bacteria. That time was not far off, amazing though it was to realize it. But Diana and her friends, these in particular of Greek ancestry, or was it Turkish— these young Martian dowsers were not awed by this imminent future, nor by their project’s vastness. It was their work, their life— to them it was human scale, there was nothing unnatural about it. On Mars, simply enough, human work consisted of pharaonic projects like this one. Creating oceans. Building bridges that made the Golden Gate look like a toy. They weren’t even watching this ridge, which would only be visible for a while longer— they were talking about other things, mutual friends in Sukhumi, that sort of thing.

“This is a stupendous act!” Maya told them sharply. “This is magnitudes bigger than anything people have been able to do before! This sea is going to be the size of the Caribbean! There’s never been any project anything like this on Earth—no project! Not even close!”

A pleasant oval-faced woman with beautiful skin laughed. “I don’t give a damn about Earth,” she said.

• • •