Mar.11 (China Military News edited from U.S. 7th Fleet and Xinhuanet) -- Five Chinese vessels shadowed and aggressively maneuvered close to the USNS Impeccable in the South China Sea March 8, a senior Pentagon official said March 9.
 
Above, a crewmember on a Chinese trawler uses a grapple hook in an apparent attempt to snag the towed acoustic array of the military Sealift Command ocean surveillance ship USNS Impeccable (T-AGOS-23). Below, two Chinese trawlers stop directly in front of the military Sealift Command ocean surveillance ship USNS Impeccable (T-AGOS-23), forcing the ship to conduct an emergency "all stop" in order to avoid collision.

The U.S. oceanographic ship was 70 miles south of Hainan Island conducting routine operations in international waters when the ships approached, Pentagon spokesman Bryan Whitman said.

"We view these as unprofessional maneuvers by the Chinese vessels and violations under international law to operate with due regard for the rights and safety of other lawful users of the ocean," Whitman said.

The incident began as the ships surrounded the Impeccable and two craft closed to within 50 feet, Whitman said. The Chinese ships included a Chinese navy intelligence collection ship, a Bureau of Maritime Fisheries patrol vessel, a State Oceanographic Administration patrol vessel and two small Chinese-flagged trawlers.

Crewmen aboard the Impeccable used fire hoses to spray one of the vessels as a protective measure. The Chinese crewmembers disrobed to their underwear and continued closing to within 25 feet.

The Chinese vessels dropped pieces of wood in the water directly in the Impeccable's path, and two of the ships stopped directly in the U.S. vessel's path, forcing it to stop.

Whitman said the Chinese used poles in an attempt to snag the Impeccable's towed acoustic array sonars. Impeccable's master used bridge-to-bridge radio circuits to inform the Chinese ships in a friendly manner that it was leaving the area and requested a safe path to navigate.

"These are dangerous close maneuvers that these vessels engaged in," Whitman said.

The incident was the culmination of earlier harassment. A Chinese patrol vessel shined a high-intensity spotlight March 4 on the USNS Victorious operating in the Yellow Sea 125 miles from China's coast. Chinese maritime aircraft "buzzed" the ship 12 times March 5.

A Chinese frigate crossed the bow of the Impeccable at a range of about 100 yards March 5. Maritime aircraft buzzed the ship after that incident.

Another Chinese ship challenged Impeccable over bridge-to-bridge radio March 7, calling its operations illegal and directing the American ship to leave the area or "suffer the consequences," officials said.

The Impeccable is one of five ocean surveillance ships that gather underwater acoustical data. U.S. ships routinely operate in the area.

But China on Tuesday said that the U.S. navy vessel violated the international and Chinese law.

"China has lodged a solemn representation to the United States as the USNS Impeccable conducted activities in China's special economic zone in the South China Sea without China's permission," Chinese Foreign Ministry spokesman Ma Zhaoxu told a regular news briefing.

"We demand that the United States put an immediate stop to related activities and take effective measures to prevent similar acts from happening," Ma said.

The Pentagon accused that Chinese ships, including a naval vessel, harassed the USNS Impeccable in international waters on Sunday.

Ma said "the U.S. claims are gravely in contravention of the facts and confuse black and white and they are totally unacceptable to China."

He added that the UN Convention on the Law of the Sea, the Law on the Exclusive Economic Zone and the Continental Shelf of the People's Republic of China, and the Regulations of the People's Republic of China on the Management of Foreign-related Marine Scientific Research, have clear regulations on foreign vessels' activities in China's exclusive economic zones.

The Chinese government always handles such activities strictly in accordance with these laws and regulations.