Jay Honeck wrote:
ask the former border patrols from East-Germany. They have some knowledge.

Nah, they couldn't keep people *in*. This is a totally different problem.

oh, I see, so the Great Wall of China or the Ligne Maginot -- both
built with the best technology available at the time, both to keep
some folks *out*, both just as successful -- would be better
examples then?

--Sylvain