Japanese submarine I-14

The submarine I-14 was a large, seaplane-carrying submarine of the Imperial Japanese Navy of the AM type. 400 feet long and 40 feet high, it didn't see action in World War II. With a range of 21,000 nmi, it could carry two or three Aichi M6A Seiran bombers, whose wings and tail could be folded to fit into the sub.

I-14 surrendered at sea at the end of the war. It was one of five subs that were brought to Hawaii at war's end, then sunk off Oahu after U.S. technicians had studied their secrets. It was located in 2009 by a group from the Hawaii Undersea Research Laboratory and National Oceanic and Atmospheric Administration.