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GCHQ vacuums up the website browsing histories using “probes” that tap into the international fiber-optic cables that transport Internet traffic across the world. A huge volume of the Internet data GCHQ collects flows directly into a massive repository named Black Hole, which is at the core of the agency’s online spying operations, storing raw logs of intercepted material before it has been subject to analysis. Black Hole contains data collected by GCHQ as part of bulk “unselected” surveillance, meaning it is not focused on particular “selected” targets and instead includes troves of data indiscriminately swept up about ordinary people’s online activities. Between August 2007 and March 2009, GCHQ documents say that Black Hole was used to store more than 1.1 trillion “events”  a term the agency uses to refer to metadata records  with about 10 billion new entries added every day. As of March 2009, the largest slice of data Black Hole held  41 percent  was about people’s Internet browsing histories. The rest included a combination of email and instant messenger records, details about search engine queries, information about social media activity, logs related to hacking operations, and data on people’s use of tools to browse the Internet anonymously.

Throughout this period, as smartphone sales started to boom, the frequency of people’s Internet use was steadily increasing. In tandem, British spies were working frantically to bolster their spying capabilities, with plans afoot to expand the size of Black Hole and other repositories to handle an avalanche of new data. By 2010, according to the documents, GCHQ was logging 30 billion metadata records per day. By 2012, collection had increased to 50 billion per day, and work was underway to double capacity to 100 billion. The agency was developing “unprecedented” techniques to perform what it called “population-scale” data mining, monitoring all communications across entire countries in an effort to detect patterns or behaviors deemed suspicious. It was creating what it saidwould be, by 2013, “the world’s biggest” surveillance engine “to run cyber operations and to access better, more valued data for customers to make a real world difference.” HERE WAS A SIMPLE AIM at the heart of the top-secret program: Record the website browsing habits of “every visible user on the Internet.” Before long, billions of digital records about ordinary people’s online activities were being stored every day. Among them were details cataloging visits to porn, social media and news websites, search engines, chat forums, and blogs.

The mass surveillance operation — code-named KARMA POLICE — was launched by British spies about seven years ago without any public debate or scrutiny. It was just one part of a giant global Internet spying apparatus built by the United Kingdom’s electronic eavesdropping agency, Government Communications Headquarters, or GCHQ. The revelations about the scope of the British agency’s surveillance are contained in documents obtained by The Intercept from National Security Agency whistleblower Edward Snowden. Previous reports based on the leaked files have exposed how GCHQ taps into Internet cables to monitor communications on a vast scale, but many details about what happens to the data after it has been vacuumed up have remained unclear.