I-400 is a submarine built by Imperial Japanese Navy in World War II era.
She was laid down in January 1943. She was designed not for torpedo hunting but launching floatplane attacks there was a grand-plan to block the Panama Canal. However this never came about, and she spent most of her short life training, and then when the plan was given the go-ahead the war ended before she got near.
She was tested and paraded by the US before being sunk in June 1946 both as a test and denial to the Soviets. Her wreck was discovered on August 1, 2013.
Her ship's bell was salvaged on March 2, 2016 and is currently undergoing conservation at the USS Bowfin Submarine Museum & Park at Pearl Harbor.
She has a long black hair.
Nicknamed as "Shion".