In 1971 Communist government of Soviet Russia has order a development of the smallest passenger helicopter in the world that could carry one person and can be folded in the tube that can be carried also by one person. They had plans to use it on the benefit of Soviet Army and Russian intelligent service.

Here we can see what they got as a result of this order. It was a Ka-56 “Wasp” helicopter, fully functional and could be used and between uses carried by one man.