Area 51 may be the world’s most famous secret military base. Established on an abandoned airfield in the Nevada desert, the facility has fueled the imaginations of conspiracy theorists scanning the skies for UFOs for decades. But the truth about Area 51’s origins, while secretive, isn’t as thrilling as alien autopsies and flying saucers.

According to Business Insider, the U.S. government intended to build a base where they could test a top-secret military aircraft without drawing attention from civilians or spies. That aircraft, the U-2 plane, needed to fly higher than any other manmade object in the skies. That way it could perform recon missions over the USSR without getting shot down.

Even over the desert, the U-2 didn’t go completely undetected during test flights. Pilots who noticed the craft high above them reported it as an “unidentified flying object.” Not wanting to reveal the true nature of the project, Air Force officials gave flimsy explanations for the sightings pointing to either natural phenomena or weather research. UFO believers were right to think the government was covering something up, they were just wrong about the alien part.

You can get the full story in the video below.

[h/t Business Insider]