Inside Menwith Hill

The 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.

The disclosures about Menwith Hill raise new questions about the extent of British complicity in U.S. drone strikes and other so-called targeted killing missions, which may in some cases have violated international laws or constituted war crimes. Successive U.K. governments have publicly stated that all activities at the base are carried out with the “full knowledge and consent” of British officials.

The revelations are “yet another example of the unacceptable level of secrecy that surrounds U.K. involvement in the U.S. ‘targeted killing’ program,” Kat Craig, legal director of London-based human rights group Reprieve, told The Intercept.

“It is now imperative that the prime minister comes clean about U.K. involvement in targeted killing,” Craig said, “to ensure that British personnel and resources are not implicated in illegal and immoral activities.”

Menwith Hill

Situated awkwardly in the heart of rolling green English countryside is the United States’ largest overseas intelligence station. Surrounded by farmland and sheep, hundreds of National Security Agency staff go to work every day at RAF Menwith Hill, where they eavesdrop on communications intercepted by satellite dishes contained in about 30 huge golf ball-like domes.

Used by the NSA since the 1960s, Menwith Hill is an important spy center. But there is growing disquiet in Britain over whether intelligence gathered at the base is being used to help with the CIA’s controversial clandestine drone strikes. And the government is keeping mum.

Earlier this month, Ken Macdonald, former chief prosecutor for England and Wales, spoke out on the subject in an interview with the London Times. He told the newspaper he believed there was compelling evidence that Britain was providing the United States with information subsequently used to help with drone attacks in countries like Pakistan. Because the United Nations says that the CIA’s covert drone campaign possibly violates international law, the allegation was politically explosive. The implication is that the British government could itself be complicit in unlawful drone bombings, which in Pakistan alone since 2004 have killed up to an estimated 3,337 people, among them hundreds of civilians.

Prior to Macdonald thrusting the issue into the spotlight, it had been simmering for some time. In May, a Pakistani student whose father was killed in a suspected U.S. drone attack launched legal action against the British government in a bid to expose whether it hands over intelligence for drone attacks on terrorist suspects. And a study published in March claimed the Menwith Hill base was being expanded to “support 'real-time' U.S. military actions, including drone attacks and those carried out by special operations forces.”

What goes on inside the Menwith station is impossible to know for sure. However, according to a 2001 European Parliament report, it is part of a surveillance network called ECHELON, situated to intercept communications routed over the Indian and Atlantic oceans. Former NSA employee Margaret Newsham, who worked at Menwith Hill 20 years ago, told CBS it monitored Russian and Chinese communications (but on one occasion spied on U.S. Sen. Strom Thurmond). And the Federation of American Scientists has claimed it is capable of intercepting an astonishing two million communications an hour.

If these reported capabilities are correct, it seems highly plausible that the base’s satellites are today intercepting at least some communications from the Middle East — which could help how the CIA picks its targets for drone strikes in countries such as Pakistan, Yemen and Somalia.

It’s also plausible that any intercepts gathered at Menwith play a crucial — not just contributory — role. In April, the Washington Post revealed that the White House had approved drone strikes in Yemen based solely on intelligence signatures. These are defined, according to the Post, as patterns of behavior indicative of a plot against U.S. interests “detected through signals intercepts, human sources and aerial surveillance.”

This brand of intelligence-led warfare has already led Germany to limit information it shares with the United States. The British government, however, does not take the same position — and is contributing to the secrecy that surrounds drone operations.

Fabian Hamilton, a member of the British Parliament, asked the government earlier this month whether Menwith Hill plays a role in the planning and deployment of drones in Afghanistan, Pakistan, Yemen, and Somalia. The response? He was not permitted to know. “For operational and security reasons we do not comment on the specific activities carried out at RAF Menwith Hill,” said Andrew Robathan, minister of state for the armed forces.

The secrecy is a problem, for basic democratic reasons if nothing else. It’s obvious that the British government wants to protect Menwith Hill’s activities on national security grounds, which might be justifiable to some extent. But if a foreign military is using a base in the English countryside to help conduct covert wars in far-flung lands, that’s a different matter altogether — and surely the British public has a right to know about it.

This article first appeared at Slate.com