The only surviving and last airframe built of the Seiran.

No Seiran (Clear sky Storm) ever saw combat but was intended to fulfill the requirement for a bomber that could operate from a submarine to strike directly at the US and strategic targets such as the Panama Canal. This is the last built as well as the only surviving airframe and is now on display at the NASM Udvar-Hazy Center.

Designed with folding wings and tail surfaces to be catapulted from submarines and used to attack the USA mainland, the first mission with Seirans on board was at sea when Japan surrendered. To shorten the launching process, they were to be catapulted from a cold start by heating the engine oil to 60°C in a separate chamber and pumping it through the engine just before launch, along with hot water. This is the only survivor of 28 built

The M6A1 Seiran was designed to emerge from large I-400 class submarines to bomb the locks in the Panama Canal. It never happened. This one received US Navy tail number 47 after capture. Note the Nakajima Kikka jet fighter, inspired by the Me 262, in the background.