On 19 April 2015, The Intercept and the "New Zealand Herald" revealed that the GCSB and the National Security Agency had worked together to tap into a data link between the Chinese Consulate-General and the Chinese Visa Office in Auckland, New Zealand's largest city. According to a leaked secret report entitled "NSA activities in progress 2013", the GCSB was providing additional technical data on the data link to the NSA's "Tailored Accessed Operations", a powerful system that hacks into computer systems and networks to intercept communications. Other leaked documents also indicated that the GCSB codenamed their Auckland tapping operation "Frostbite" while their American counterparts called it "Basilhayden", after a Kentucky bourbon that was once regarded as the fictional spy James Bond's favourite alcoholic beverage. In response, a Chinese Embassy spokesman told the "New Zealand Herald" that China was concerned about the report and attached great importance to the cybersecurity issue.