During the second world war, the people of the country of the rising sun have developed sophisticated technology Underwater boats that could completely change the course of the war, fully able to make a dent in the American forces. In 2009, National Geographic conducted an expedition to the peninsula Oahu in Hawaii. There, Terry Kerby and Max Cremer of Research Underwater Laboratory (throw) of the Institute of Hawaii found the Imperial Japanese submarine, as it is clear from the flooded island Oahu in 1946.
Marine engineering