Researchers find the remains of an advanced submarine sunk by the U.S. Navy in 1946 . Hide Caption 8 of 10 Photos:Photos: The I-400 was one of five Japanese submarines captured by the U.S. Navy at the end of World War II and sent to Hawaii for examination , the school said . The Soviet Union wanted to inspect the sub 's advanced technology . The sub represented a big shift in submarine tactics , a researcher says .
Researchers find the remains of an advanced submarine sunk by the U.S. Navy in 1946 . Hide Caption 8 of 10 Photos:Photos: The Soviet Union wanted to inspect the sub 's advanced technology . The sub represented a big shift in submarine tactics , a researcher says .