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Off Oahu Lies a 122-Metre Japanese Submarine that the US Navy Sank Itself Since 1946: It Took Until 2013 to Find It.

Summary by SciencePost
A 122-metre steel mastodon, the I-400, has been resting 700 metres under the waves since its collapse in 1946 by the U.S. Navy. This underwater aircraft carrier, designed to hit the U.S. coasts, disappeared from radars for 67 years before being rediscovered in 2013 by a team of Hawaiian researchers. More
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A 122-metre steel mastodon, the I-400, has been resting 700 metres under the waves since its collapse in 1946 by the U.S. Navy. This underwater aircraft carrier, designed to hit the U.S. coasts, disappeared from radars for 67 years before being rediscovered in 2013 by a team of Hawaiian researchers. More

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SciencePost broke the news on Thursday, July 30, 2026.
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