For unknown and undisclosed reasons
I need some help and information.
What were some secret projects that both the Axis and the Allies were working on during World War II and planning on completing or doing after World War II? I mainly need Axis, because the Allies won't be as important in what I need this for, but any information would be great.
I know that Japan was developing, and even had some, of those submarine aircraft carriers, where the planes would have their wings fold up so they could fit into a submerged tube, when surfaced would pack a punch.
What else? Tanks, planes, ships, giant weapons, anything would be great.
Thanks.