Although there was no sky glare in the water, the Murderer supposed the diver had found an open lead in the ice and would rather freeze to death, or at least put up a fight from the edge of the ice, than die in the water. * * * * * Valving more air into the minisub's flotation tanks, the Murderer steered it rapidly up into the oddly round, oddly dim lead in the ice pack. At the edge of his mask-vision he glimpsed a longish tubular shape suspended in the water, but the minisub was rising too fast for him to get a good look. The overbuoyant minisub bloomed above the surface and sloshed back, rolling unsteadily while the film of water slid off his mask without freezing and he saw. The white blur became the biggest twin-rotored copter he had ever seen, squatting there on the ice, white except for its glass. Then his eyes were attracted by motion, by the parka-clad men hauling the surviving diver up on the ice. Other darkish figures were simply standing there, some of them beginning to point. Behind them was a smaller helicopter with the loop-shaped aerial of a radio location finder mounted atop its plastic dome. There was something wrong with the sky, and the Murderer realized it was not the sky. It was a vast white canvas dome, dimpling in the polar wind. The unnatural circle in the ice and the equipment grouped around it all were hidden from aerial observation. Pointing at him from the fuselage of the huge helicopter, and so close that his eyes had avoided it, was a metal boom with a hoist cable taut into the water, tethering something below the surface. Some of the men were running toward the huge helicopter now. In front of them at the edge of the ice lay shapeless bundles of what appeared to be black rubberized canvas, and he wondered fleetingly if these contained more of the soon-to-be gelatinous picket buoys. One of the figures was aiming something at him. As the Murderer let air out of the flotation tanks and swiftly sank, he realized it had not been a gun; it had been a camera with a telephoto lens. He passed the tubular shape on the end of the cable. It was an anti-submarine torpedo. When he sank deeper, he passed a cylinder dangling from two black rubber-insulated cables. He valved compressed air back into the flotation tanks and came up under the ice, so hazardously close he had to duck his head as he steered a weaving course among the downward bulges of old Siberian ice. Even though he had been deafened, he felt the sonar pulsing against the ice, searching for him. Then he felt it knocking against the minisub, pinging against his air tanks, thudding accusingly against his bones. It followed him wherever he steered.