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Awesome engineering by the Japanese but too late to proved their worth
That is one bad ass submarine and a great feat of engineering by the Japanese. Like the other commenter said its great but quite late.
The video doesn’t work anymore, but if they’re talking about the B1 type sub those were active since before Pearl Harbor and actually did prove their worth.
One of their onboard planes did a night-time flyover of Pearl before the bombing and the sub served as a radio relay for the fleet. They preyed on shipping all over the Atlantic. I-15 sank the USS Wasp and USS Obrien (and wounded the North Carolina) in a single 6-torpedo spread. I-25 conducted one of the only Continental US coastal bombardments of the war, and its onboard seaplane conducted the only Continental US aerial bombing of the entire war.
By the end of the war they’d stripped the planes out to accomodate manned suicide torpedoes, but they were a part of pretty much the entire conflict.
You think that is big, there is a Goliath sub (quite literally) that had the storage space for 3 Japanese zeros. It was a bit bigger I think. XD