Information Center had been warned of what was later privately called Operation Terror while Lockley was still tranquilly cooking breakfast and thinking—frowning a little—about Jill.

[9]

Naturally he knew nothing of emergency orders sending all planes aloft. He wasn't informed about something reported in space and apparently headed for an impact point at Boulder Lake. As the computed impact time arrived, Lockley obliviously dumped coffee into his tin coffeepot and put it back on the flames.

At 8:13 instead of 8:14—this information is from the tape records—there was an extremely small earth shock recorded by the Berkeley, California, seismograph. It was a very minor shock, about the intensity of the explosion of a hundred tons of high explosive a very long distance away and barely strong enough to record its location, which was Boulder Lake. The cause of that explosion or shock was not observed visually. There'd been no time to alert observers, and in any case the object should have been out of atmosphere until the last few seconds of its fall, and where it was reported to fall the cloud cover was unbroken. So nobody reported seeing it. Not at once, anyhow, and then only one man.

Lockley did not feel the impact. He was drinking a cup of coffee and thinking about his own problems. But a delicately balanced rock a hundred yards below his camp site toppled over and slid downhill. It started a miniature avalanche of stones and rocks. The loose stuff did not travel far, but the original balanced rock bounced and rolled for some distance before it came to rest.

Echoes rolled between the hillsides, but they were not very loud and they soon ended. Lockley guessed[10] automatically at half a dozen possible causes for the small rock-slide, but he did not think at all of an unperceived temblor from a shock like high explosives going off thirty miles away.

[10]

Eight minutes later he heard a deep-toned roaring noise to the northeast. It was unbelievably low-pitched. It rolled and reverberated beyond the horizon. The detonation of a hundred tons of high explosives or an equivalent impact can be heard for thirty miles, but at that distance it doesn't sound much like an explosion.

He finished his breakfast without enjoyment. By that time well over three-quarters of the Air Force on the Pacific Coast was airborne and more planes shot skyward instant after instant. Inevitably the 

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