National Geographic
The CIA created Area 51 in 1955 to test and develop top secret U.S. military projects in the remote Nevada desert. More than 50 years later, the base still doesn't officially exist and appears on no public U.S. government maps.
In the 1950s and '60s, Area 51 was the epicenter of the OXCART project, intended to create the successor for the U-2 spy plane.
The OXCART plane was expected to be undetectable in the air as it flew surveillance and information-gathering missions over the Soviet Union. But Area 51 personnel soon found it necessary to conceal the craft from the Soviets eyes even when it was still being tested on the ground.
Cat and Mouse at Area 51
It was discovered that Soviet spy satellites, dubbed ash cans by Area 51 staff, were making regular rounds over Nevada.
U.S. intelligence agencies, though, provided Area 51 workers with a decisive advantage in this international "game of cat and mouse," according to T.D. Barnes, a former hypersonic flight specialist at Area 51 whose expertise was in electronic counter measures.
No longer sworn to secrecy by the CIA, Barnes said, "In our morning security meetings, they'd give us a roster of the satellites that the Soviets had in the air, and we'd know the exact schedule of when they were coming over.
"It was like a bus schedule, and it even told us whether it was an infrared satellite or what type it was," Barnes told National Geographic news.
Pretty cool write up. Some amazingly low tech solutions to the "problems" too. I love this:
It turned out that even laborious hooting and scooting weren't enough. Spies had learned that the Soviets had a drawing of an OXCART plane—obtained, it was assumed, via an infrared satellite.
As a plane sat in the hot desert, its shadow would create a relatively cool silhouette, visible in infrared even after the plane had been moved inside.
"It's like a parking lot," Barnes told National Geographic News. "After all the cars have left you can still see how many were parked there [in infrared] because of the difference in ground temperatures."
To thwart the infrared satellites, Area 51 crews began constructing fanciful fake planes out of cardboard and other mundane materials, to cast misleading shadows for the Soviets to ponder. (Not intended to be seen, the decoys themselves were scooted out of sight before satellite flyovers.) Sometimes staff even fired up heaters near imaginary engine locations to make it look as if planes had just landed.
"We really played with the infrared satellites," Barnes recalled.
