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For more than a decade, U.S. officials have refused to say what secrets China might have gleaned from the plane. Two years after the incident, journalists saw a redacted U.S. military report, which revealed that although crew members had jettisoned documents out an emergency hatch as they flew over the sea and had managed to destroy some signals-collection equipment before the plane fell into the hands of the Chinese, it was “highly probable” China had still obtained classified information from the plane. Attempts by journalists and academics to learn more over the years have been unsuccessful.

But now, a comprehensive Navy-NSA report completed three months after the collision, and included among documents obtained by NSA whistleblower Edward Snowden in 2013, finally reveals extensive details about the incident, the actions crew members took to destroy equipment and data, and the secrets that were exposed to China — which turned out to be substantial though not catastrophic.