Divers find WWII Japanese sub

Last updated 10:21 04/12/2013

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Scientists plumbing the Pacific Ocean off the Hawaii coast have discovered a World War II era Japanese submarine, a technological marvel that had been preparing to attack the Panama Canal before being scuttled by US forces.

The 122-metre Sen-Toku class vessel - among the largest pre-nuclear submarines ever built - was found in August off the southwest coast of Oahu and had been missing since 1946, scientists at the University of Hawaii at Manoa said.

The I-400 and its sister ship, the I-401, which was found off Oahu in 2005, were able to travel one and a half times around the world without refuelling and could hold up to three folding-wing bombers that could be launched minutes after resurfacing, the scientists said.

The accidental discovery of the 1-400, an aircraft-toting I-400 mega sub, on the rock- and debris-littered ocean floor, about 700m feet beneath the surface, has solved the mystery surrounding a ship long thought to be further afield.

"We came upon this as we were looking for other targets ... It is like watching a shark at rest," said Jim Delgado, a researcher aboard the Pisces V deep-diving submersible which traveled to the wreckage.

The US Navy captured five Japanese subs, including the I-400, at the end of World War Two and brought them to Pearl Harbor for inspection, the scientists said.

"It was torpedoed, partially collapsed and had sunk at a steep angle," said Delgado, an archaeologist with the National Oceanic and Atmospheric Administration (NOAA), which helped to fund the dive.

US forces sank the submarines and claimed to have no information on their precise location, in an apparent bid to prevent their technology falling into the hands of the Soviet Union, which had demanded the ships be returned to Japan.

Other mega subs have been found in waters off Oahu and in the Sea of Japan. One in the submarine class remains missing.

The discovery of the I-400 was announced after NOAA had reviewed its findings with the US State Department and Japanese government officials, researchers said.

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- Reuters

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