Sunken I-400 Submarine's Airplane Hangar

See the wreckage of a sunken I-400 submarine's missing aircraft hangar that was recently found by divers off the coast of O'ahu.

Sunken I-400 Submarine Hangar
Sunken I-400 Submarine Hangar
Divers recently captured the first view of the hangar of a sunken I-400 submarine off the coast of O'ahu. (Photo: NOAA)
Sunken I-400 Submarine Hangar
Sunken I-400 Submarine Hangar
While the main wreckage of the sunken submarine was found a few years ago, the recent dive constituted the first time researchers ever viewed the hangar, which was separated from the other wreckage by explosive forces when the United States intentionally sank the submarine after World War II. (Photo: NOAA)
Sunken I-400 Submarine Hangar
Sunken I-400 Submarine Hangar
In this image U.S. Navy servicemen can be seen studying the I-400's hangar.
Sunken I-400 Submarine Hangar
Sunken I-400 Submarine Hangar
The I-400's cylindrical hangar was large enough to house three Aichi M6A Seiran attack seaplanes. The planes, which were folded inside the hangar, could be prepared for launch within just 45 minutes.
Sunken I-400 Submarine Hangar
Sunken I-400 Submarine Hangar
Three I-400s were built toward the end of the war, and the submarines were substantially larger than any other existing sub at the time.