WWII Aircraft-Carrier Submarine Discovered Off The Coast Of Oahu After Being Lost Since 1946 [VIDEO]

A Japanese World War II submarine, the I-400, was discovered by the Hawaii Undersea Research Laboratory, HURL. The submarine was largest ever built prior to the construction of nuclear-powered subs and had a range of 37,500 miles. The Sen-Toku class sub was an impressive feat of engineering even to this day. In the press release, HURL says the I-400 sub could travel around the world one and half times before refueling, something that has yet to be replicated by other diesel-electric subs.