Chinese produce new type of sub

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China's naval buildup has produced a new type of attack submarine that U.S. intelligence did not know was under construction, according to U.S. defense and intelligence officials.

The submarine was spotted several weeks ago for the first time and has been designated by the Pentagon as the first Yuan-class of submarine.

A photograph of the completed submarine in the water at China's Wuhan shipyard was posted on a Chinese Internet site this week and confirmed by a defense official as the new submarine. Wuhan is located inland, some 420 miles west of Shanghai.

One official said the new submarine was a "technical surprise" to U.S. intelligence, which was unaware that Beijing was building a new non-nuclear powered attack submarine. U.S. intelligence agencies have few details about the new submarine but believe it is diesel-powered rather than nuclear-powered, said officials who spoke on the condition of anonymity.

The new boat, which appears to be a combination of indigenous Chinese hardware and Russian weapons, suggests that China is building up its submarine forces in preparation for a conflict over Taiwan, defense analysts say.

"China has decided submarines are its first-line warships now, their best shot at beating carriers," said Sid Trevethan, an Alaska-based specialist on the Chinese military. "And China is right."

"One has to marvel at the enormity of the investment by the People's Liberation Army in submarines," said Richard Fisher, a specialist on the Chinese military.

China also is building two nuclear-powered submarines -- one Type 093, believed to be based on the Russian Victor-III class and armed with intercontinental ballistic missiles, and a Type 094 attack submarine, which the Pentagon believes has a finished hull and will be ready for deployment next year.

According to Mr. Trevethan, China currently has a force of 57 deployed submarines, including one Xia-class nuclear ballistic missile submarine, five Han submarines, four Kilos, seven Songs, 18 Mings and 22 Soviet-designed Romeos. Beijing also has eight more Kilos on order with Russia.

Disclosure of the new submarine comes as the United States is trying to sell eight diesel submarines to Taiwan, which Beijing views as a breakaway province. Taiwan currently has just two World War II-era Guppy-class submarines and two 1980s Dutch submarines.