They find the remains of an advanced submarine sunk by the U.S. Navy in 1946 . The submarine was essentially an underwater aircraft carrier . With tensions rising between the Soviet Union and the United States after the war , the Navy scuttled the ships to avoid their advanced technology falling into the hands of the Soviet navy in what would become one of the first intrigues of the Cold War . The Soviet Navy wanted to exploit the submarine 's advanced technology . The submarine represented a big shift in submarine tactics , a researcher says .
They find the remains of an advanced submarine sunk by the U.S. Navy in 1946 . The submarine was essentially an underwater aircraft carrier . The Soviet Navy wanted to exploit the submarine 's advanced technology . The submarine represented a big shift in submarine tactics , a researcher says .