Japan. Notes Sources Hackett, Bob & Kingsepp, Sander. IJN Submarine I-33: Tabular Record of Movement. Retrieved on August 28, 2020. Type B1 submarines Ships built by Mitsubishi Heavy Industries 1941 ships World War II submarines of Japan Japanese submarines lost during World War II Maritime incidents in September 1942 Maritime incidents in June 1944 World War II shipwrecks in the Pacific Ocean Shipwrecks in the Inland Sea Japanese submarine accidents