 Ballard 's subsequent search for the Japanese carriers was unsuccessful . In September 1999 , a joint expedition between Nauticos Corp. and the U.S. Naval Oceanographic Office searched for the Japanese aircraft carriers . Using advanced renavigation techniques in conjunction with the ship 's log of the submarine USS Nautilus , the expedition located a large piece of wreckage , subsequently identified as having come from the upper hangar deck of Kaga . The main wreck of Kaga has yet to be located . 
