http://www.dailymail.co.uk/pages/live/articles/news/worldnews.html?in_article_i
d=492804&in_page_id=1811

American military chiefs have been left dumbstruck by an undetected Chinese
submarine popping up at the heart of a recent Pacific exercise and close to
the vast U.S.S. Kitty Hawk - a 1,000ft supercarrier with 4,500 personnel on
board.

"It was certainly a wake-up call for the Americans.

"It would tie in with what we see the Chinese trying to do, which appears to
be to deter the Americans from interfering or operating in their backyard,
particularly in relation to Taiwan."

In January China carried a successful missile test, shooting down a satellite
in orbit for the first time.