Although the Cold War ended with dissolution of the Soviet Union in 1989, Russian submarines still conduct limited patrol activities off the coasts of other nations. Until late 1994 one such boat was hull number 540, of the 1950s-vintage Foxtrot class. Built in Leningrad in 1971, it was one of the last three Foxtrots in the Russian Pacific Fleet.
The 540 often patrolled off the East Coast of Australia, probably observing the Australian Navy on maneuvers. She may have even 'visited' the approaches to Sydney Harbor where major naval facilities exist.