he narrow roads are quiet and winding, surrounded by rolling green fields and few visible signs of life beyond the occasional herd of sheep. But on the horizon, massive white golf ball-like domes protrude from the earth, protected behind a perimeter fence that is topped with piercing razor wire. Here, in the heart of the tranquil English countryside, is the National Security Agency’s largest overseas spying base.
Once known only by the code name Field Station 8613, the secret base — now called Menwith Hill Station — is located about nine miles west of the small town of Harrogate in North Yorkshire. Originally used to monitor Soviet communications through the Cold War, its focus has since dramatically shifted, and today it is a vital part of the NSA’s sprawling global surveillance network.
For years, journalists and researchers have speculated about what really goes on inside Menwith Hill, while human rights groups and some politicians have campaigned for more transparency about its activities. Yet the British government has steadfastly refused to comment, citing a longstanding policy not to discuss matters related to national security.
Now, however, top-secret documents obtained by The Intercept offer an unprecedented glimpse behind Menwith Hill’s razor wire fence. The files reveal for the first time how the NSA has used the British base to aid “a significant number of capture-kill operations” across the Middle East and North Africa, fueled by powerful eavesdropping technology that can harvest data from more than 300 million emails and phone calls a day.
Over the past decade, the documents show, the NSA has pioneered groundbreaking new spying programs at Menwith Hill to pinpoint the locations of suspected terrorists accessing the internet in remote parts of the world. The programs — with names such as GHOSTHUNTER and GHOSTWOLF — have provided support for conventional British and American military operations in Iraq and Afghanistan. But they have also aided covert missions in countries where the U.S. has not declared war. NSA employees at Menwith Hill have collaborated on a project to help “eliminate” terrorism targets in Yemen, for example, where the U.S. has waged a controversial drone bombing campaign that has resulted in dozens of civilian deaths.