San Francisco - A pair of Google employees involved with the internet company's security systems have publicly lashed out at the National Security Agency, with one of the employees accusing the organisation of subverting the law by intercepting communications on cables linking Google's various data centres.Nobody at the US National Security Agency or the British intelligence agency "will ever stand before a judge and answer for this industrial-scale subversion of the judicial process", wrote Mike Hearn, an engineer at Google, on his personal Google+ page.The comments follow a report in the Washington Post last week that the NSA had gained access to an overseas cable or switch that relayed Google and Yahoo traffic through an unnamed telecommunications provider. The report is the latest revelation based on secret NSA documents leaked by former contractor Edward Snowden.Hearn, whose profile on the Google+ website lists him as a Zurich-based software engineer who has worked at Google since 2006, said in the post that he had worked on an "anti-hacking system" at Google for two years."We designed this system to keep criminals out. There's no ambiguity here," Hearn wrote. "Bypassing that system is illegal for a good reason," he said, noting that the judicial system of warrants and rules of evidence provided an effective and time-honoured way to prevent crime while limiting excessive intrusions into privacy.Leaked documentsHearn said he was issuing a "giant fuck you to the people who made these slides", referring to the illustrations in the leaked documents that depicted how the NSA was able to access the data.The strident comments echo those last week by Brandon Downey, who identified himself as a network security engineer on his personal Google+ web page."Even though we suspected this was happening, it still makes me terribly sad," Downey wrote. "The US has to be better than this," he said in a post that opened with "fuck these guys", referring to the NSA.A person close to the company confirmed that Hearn and Downey are Google employees.Both Hearn, who personally thanked Snowden in his post, and Downey said they were voicing their personal opinions and not speaking on behalf of Google. Google declined to comment on their postings.Google, the world's No1 internet search engine, said last week that it was "outraged" by the government's actions and called for urgent reform.The internet company has faced its own criticism about intercepting data in the past, most notably when it acknowledged in 2010 that a fleet of cars it operates to map the world's streets had mistakenly collected passwords and other personal data from home consumers' wireless networks over a two year-period.DataThe newly disclosed NSA programme, operated jointly with the UK's Government Communications Headquarters, or GCHQ, amassed 181 million records in one recent 30-day span, according to one document reported by the Post. It could not be ascertained how much of that included material from US residents, how the agency redacted data on them or how much of the information was retained.An NSA spokesperson said in a statement last week that the suggestion in the Post article that the agency relies on a presidential order on foreign intelligence gathering to skirt domestic restrictions imposed by the Foreign Intelligence Surveillance Act and other laws "is not true"."The assertion that we collect vast quantities of US persons' data from this type of collection is also not true," the statement said. "NSA is a foreign intelligence agency. And we're focused on discovering and developing intelligence about valid foreign intelligence targets only."