[yangl1996]

The Japanese Navy had similar ideas [1] in WWII. The plan was to sail undetected to near the west coast, launch the planes, and drop some biological weapon. Basically the predecessor of today's missile-carrying submarines.

[1] https://en.wikipedia.org/wiki/I-400-class_submarine

[rozab]

Here's a good video on these from Mustard:

https://www.youtube.com/watch?v=gxyk84t4Q8w

They have loads of content on weird military hardware like this.

[Y_Y]

> "Some biological weapon"

It was a box of plague fleas.

See also: Operation Cherry Blossom at Night

[gerdesj]

Read the article, specifically the section headed: "Earlier aircraft carrying submarines".