PARANOIA

DANBURY, Connecticut (AP) — For more than a decade they toiled in the strange, boxy-looking building on the hill above the municipal airport, the building with no windows (except in the cafeteria), the building filled with secrets. They wore protective white jumpsuits, and had to walk through air-shower chambers before entering the sanitized "cleanroom" where the equipment was stored. They spoke in code.

Few knew the true identity of "the customer" they met in a smoke-filled, wood-paneled conference room where the phone lines were scrambled. When they traveled, they sometimes used false names.

At one point in the 1970s there were more than 1,000 people in the Danbury area working on The Secret. [...]

It was dubbed "Big Bird" and it was considered the most successful space spy satellite program of the Cold War era. From 1971 to 1986 a total of 20 satellites were launched, each containing 60 miles (100 kilometers) of film and sophisticated cameras that orbited the earth snapping vast, panoramic photographs of the Soviet Union, China and other potential foes. The film was shot back through the earth's atmosphere in buckets that parachuted over the Pacific Ocean, where C-130 Air Force planes snagged them with grappling hooks.

The scale, ambition and sheer ingenuity of Hexagon KH-9 was breathtaking. The fact that 19 out of 20 launches were successful (the final mission blew up because the booster rockets failed) is astonishing.

So too is the human tale of the 45-year-old secret that many took to their graves. [...]

According to the National Reconnaissance Office, a single Hexagon frame covered a ground distance of 370 nautical miles (680 kilometers), about the distance from Washington to Cincinnati. Early Hexagons averaged 124 days in space, but as the satellites became more sophisticated, later missions lasted twice as long. [...] Among other successes, Hexagon is credited with providing crucial information for the Strategic Arms Limitation Talks between the United States and the Soviet Union in the 1970s.

From the outset, secrecy was a huge concern, especially in Danbury, where the intense activity of a relatively small company that had just been awarded a massive contract (the amount was not declassified) made it obvious that something big was going on. Inside the plant, it was impossible to disguise the gigantic vacuum thermal chamber where cameras were tested in extreme conditions that simulated space. There was also a "shake, rattle and roll room" to simulate conditions during launch.

"The question became, how do you hide an elephant?" a National Reconnaissance Office report stated at the time. It decided on a simple response: "What elephant?" Employees were told to ignore any questions from the media, and never confirm the slightest detail about what they worked on.

But it was impossible to conceal the launches at Vandenberg Air Force base in California, and aviation magazines made several references to "Big Bird." In 1975, a piece on the TV news magazine "60 Minutes" on space reconnaissance described an "Alice in Wonderland" world, where American and Soviet intelligence officials knew of each other's "eyes in the sky" — and other nations did, too — but no one confirmed the programs or spoke about them publicly....