[yarddog]

I am sure I have read that the German “Paris Gun” of WWI entered what is considered space before descending.

[frank ballenger]

The Guns of Navarone

and Jules Verne’s From the Earth to the Moon.

[TexasGator]

“I am sure I have read that the German “Paris Gun” of WWI entered what is considered space before descending.”

The Paris Gun fell far short of the Karman Line.