Sam Spade's San Francisco

This story from GlobalSecurity.org pulled the rug out from under my sense of well-being and security:

A submerged Song-class attack submarine shadowed the US Navy aircraft carrier CV-63 Kitty Hawk in the East China Sea near Okinawa without being detected on 26 October 2006. The boat surfaced within five miles of the carrier, and only then was it spotted, by one of the carrier's planes on a routine surveillance flight.

The submarine is normally equipped with wake-homing torpedos and anti-ship cruise missiles. Disclosure of the submarine encounter came while US Navy Admiral Gary Roughead, Coammander of the US Pacific Fleet, was in China holding talks with Chinese navy leaders. The encounter was a clear embarrassment to Admiral William J. Fallon, Commander of US forces in the Pacific, who has engaged in an ambitious military exchange program with China.

Story tools:
The full story from GlobalSecurity.org
Song S-20 class submarine specs (GlobalSecurity.org web page)
CV-63 USS Kitty Hawk (United States Government military web site)