The I-400 was constructed as a submersible aircraft carrier the like the world had never seen, and was able to launch three Seiran aircraft. With an overall length of 122m, width of 12m, and a 6,560 ton displacement, the size was comparable to a destroyer class warship and it was the world's largest submarine at the time. In addition, it had the ability to circumnavigate the world one and a half times without needing to refuel or restoct. It was believed  for the I-400 to be able to make surprise attacks both on the U.S. East Coast and the Allied-held Panama Canal. Construction of the I-400 was completed near the end of the WWII in December 1944. It was on its way with the second submarine in its class the I-401 to the U.S. Naval base at Ulithi, however neither submarine saw action due to the end of the war. It is said that due to its superior design, the I-400 is a forerunner of modern day strategic nuclear missile submarines.

• Clear parts around the cylindrical hangar let you show off the three Seiran aircraft that can be placed inside

• Photo-etched parts to provide incredible detail on crane arm, antenna pole, Seiran propellers and handrails

• Guideline stickers to help attach the handrail more accurately

• 4x Metal torpedoes included

• Length: 348.5mm

• Width: 34.2mm