Unexplained Mysteries :: Invasion of the Chinese cyberspies: Titan Rain: "It was another routine night for Shawn Carpenter. After a long day analyzing computer-network security for Sandia National Laboratories, where much of the U.S. nuclear arsenal is designed, Carpenter, 36, retreated to his ranch house in the hills overlooking Albuquerque, N.M., for a quick dinner and an early bedtime. He set his alarm for 2 a.m. Waking in the dark, he took a thermos of coffee and a pack of Nicorette gum to the cluster of computer terminals in his home office. As he had almost every night for the previous four months, he worked at his secret volunteer job until dawn, not as Shawn Carpenter, mid-level analyst, but as Spiderman--the apt nickname his military-intelligence handlers gave him--tirelessly pursuing a group of suspected Chinese cyberspies all over the world. Inside the machines, on a mission he believed the U.S. government supported, he clung unseen to the walls of their chat rooms and servers, secretly recording every move the snoopers made, passing the information to the Army and later to the FBI.

The hackers he was stalking, part of a cyberespionage ring that federal investigators code-named Titan Rain, first caught Carpenter's eye a year earlier when he helped investigate a network break-in at Lockheed Martin in September 2003. A strikingly similar attack hit Sandia several months later, but it wasn't until Carpenter compared notes with a counterpart in Army cyberintelligence that he suspected the scope of the threat. Methodical and voracious, these hackers wanted all the files they could find, and they were getting them by penetrating secure computer networks at the country's most sensitive military bases, defense contractors and aerospace companies."