Singapore and South Korea are playing key roles helping the United States and Australia tap undersea telecommunications links across Asia, according to top secret documents leaked by former US intelligence contractor Edward Snowden. New details have also been revealed about the involvement of Australia and New Zealand in the interception of global satellite communications.

A top secret United States National Security Agency map shows that the US and its “Five Eyes” intelligence partners tap high speed fibre optic cables at 20 locations worldwide. The interception operation involves cooperation with local governments and telecommunications companies or else through “covert, clandestine” operations.

Leaked documents: Edward Snowden. Credit:AP

The undersea cable interception operations are part of a global web that in the words of another leaked NSA planning document enables the “Five Eyes” partners – the US, United Kingdom, Australia, Canada and New Zealand - to trace “anyone, anywhere, anytime” in what is described as “the golden age” signals intelligence.

The NSA map, published by Dutch newspaper NRC Handelsblad overnight, shows that the United States maintains a stranglehold on trans-Pacific communications channels with interception facilities on the West coast of the United States and at Hawaii and Guam, tapping all cable traffic across the Pacific Ocean as well as links between Australia and Japan.