Type 4 Chi-To tank. The most technically advanced Japanese tank to make production during the war, the Chi-To was supposed to be equivalent to a German Panther. It's long barreled 75 mm main gun was far superior to other Japanese tanks. Due to material shortages, only two were produced before the end of the war, and neither saw combat. The two examples were sunk in Lake Hamara to prevent capture, and attempts to recover one have so far been unsuccessful.