Kevin Hulsey's Technical Illustrations.

the narrator says one of the people involved was called "Cholmondeley". I can't speak for the gentleman in question but that surname is more usually pronounced "Chom Lee". https://www.youtube.com/watch?v=4NTLkJqpC-A
It's a very strangely pronounced surname with no clues as to how it should be said, but amusing to hear the narrator say "Chol Mon Delay". (He could of course be right in this case?)

That was fascinating! I wonder what other secret stories would be declassified and come out in more recent wars.

Ha, I read that as Operation Minecraft