He pulled himself out of an intense recreation of Eric’s end, feeling shaken. They got a breathing rig attached to his upper arm and face mask, and abruptly he was breathing cold dry air, pure oxygen they said. Bly asked again about going down, as Nirgal was shivering slightly. “No no,” said Nirgal. “I’m good with cold, this water isn’t that cold. Besides I’ve already filled the suit with sweat.”

The other divers nodded, sweating themselves. Getting ready was hard work. The actual swimming was easier; down a ladder and, ah, yes, out of the crush of the g, into something very like Martian g, or lighter still; such a relief! Nirgal breathed in the cold bottled oxygen happily, almost weeping at the sudden freedom of his body, floating down through a comfortable dimness. Ah yes— his world on Earth was underwater.

Down deeper, things were as dark and amorphous as they had been on the screen, except for within the cones of light emanating from the other two men’s headlamps, which were obviously very strong. Nirgal followed above and behind them, getting the best view of all. The estuary water was cool, about 285 K Nirgal judged, but very little of it seeped in at the wrists and around the hood, and the water trapped inside the suit was soon so hot with his exertions that his cold hands and face (and left ribs) actually served to keep him from overheating.

The two cones of light shot this way and that as the two divers looked around. They were swimming along a narrow street. Seeing the buildings and the curbs, the sidewalks and streets, made the murky gray water look uncannily like the mist up on the surface.

Then they were floating before a three-story brick building, filling a narrow triangular space that pointed into an angled intersection of streets. Kev gestured for Nirgal to stay outside, and Nirgal was happy to oblige. The other diver had been holding a cable so thin it was scarcely visible, and now he swam into a doorway, pulling it behind him. He went to work attaching a small pulley to the doorway, and lining the cable through it. Time passed; Nirgal swam slowly around the wedge-shaped building, looking in second-story windows at offices, empty rooms, flats. Some furniture floated against the ceilings. A movement inside one of these rooms caused him to jerk away; he was afraid of the cable; but it was on the other side of the building. Some water seeped into his mouthpiece, and he swallowed it to get it out of the way. It tasted of salt and mud and plant life, and something unpleasant. He swam on.