61 Hours

first discovery was a crashed vehicle four miles south of the epicentre. It was an airport de-icing truck reported as stolen from a commercial airfield east of Rapid City. It seemed to have been driving south on the old county two-lane leading away from the site. The road was snowbound and the surface was bad. It seemed that the truck had skidded off the road and turned over at least twice. It was an ungainly vehicle.
    Two bodies were found close by. Two unidentified men of Hispanic origin, wearing dark suits apparently purchased in Mexico, under brand new winter parkas. The men had severe perimortem injuries, presumably caused by the crash, but they had died of exposure, presumably after crawling away from the wreckage. They were both carrying illegal fully automatic weapons. One gun seemed to have fired three rounds, and the other, nine. With that news, the Bureau of Alcohol, Tobacco and Firearms joined the roster of waiting agencies.
    The patrols crept closer. By the middle of the second day the forward operating bases had been moved up to the southern edge of an old air force runway. At that new location they discovered a damaged and undriveable unmarked police car. It was positively identified by locals as the Bolton PD’s property. It had been issued to the department’s chief, Tom Holland. Holland had disappeared on the night of the fire. The Bolton PD was in disarray. It was dealing with three recent homicides, one of the victims being its own deputy chief, Andrew Peterson.
    An observant fire officer taking a walk found the burned-outhusks of two road flares, one in each corner of the old runway, apparently carefully placed. Which suggested the possibility of an unauthorized night landing. No flight plan had been recorded with the FAA. But through binoculars some agents claimed to see twisted wreckage just south of the epicentre that might or might not have been the remains of a large airliner. With that news, the National Transportation Safety Board joined the queue.
    By the middle of the third day the Air Defense satellites showed the outer perimeter to have cooled to seventy degrees. The patrols moved up. The outer perimeter seemed to be about a hundred yards in diameter. Clearly some kind of fireball had bloomed, burned, and died back, but it had been brief compared to the main fire. The arson theorists began to run simulations on their laptops. Close inspection of the area inside the perimeter showed grievous damage. There was a dusting of ash a hundred feet out that might have been the remains of a human being. There was scorched and twisted aluminum that the NTSB claimed was the remains of an airliner, possibly a Boeing, possibly a 737.
    The patrols moved up, into a dead world of twisted smoking fragments, some made of iron, some made of steel, some possibly from a vehicle, some smaller pieces possibly from weapons. Piled everywhere was debris from the plane. No attempt was made to quantify human remains. It would have been a hopeless task. Dust to dust, ashes to ashes, literally.
    The only remotely intact structure was a small concrete stair head bunker disguised to look like a stone house. The air force claimed ownership. The original plans were lost, but anecdotally it was known to have been built fifty years previously, to contemporary blast-proof construction standards. It had stood up well. The roof was damaged. The interior concrete was blistered and spalled and calcified, but still reasonably solid. There were three circular shafts dropping down through the floor. It was surmised that once there had been steel casings for two ventilation ducts, and a spiral staircase probably also made of steel, but they had first melted and then vaporized.
    Which proved, the arson people said, that the fire had started underground.
    They donned protective gear and were lowered what turned out to be a total of two hundred and ten feet into the earth. They found a sequence of small tunnels and chambers, more blistered and spalled and calcified concrete, some ash that might once have been organic, and, amazingly, more than one thousand intact diamonds.
    The arson specialists set up shop in the Bolton police station and connected their laptops wirelessly to their mainframes back home. They started work. They drew three-dimensional models of the underground facility. They made some guesses and assumptions. They knew from police records that a pump truck had been stolen along with the de-icer. So, if the aluminum