On Thu, 5 May 2016, Noel Chiappa wrote:
If you want to see a great example of why it was important, check out the so-called 'Berlin Tunnel': https://en.wikipedia.org/wiki/Operation_Gold http://www.fas.org/irp/cia/product/tunnel-200702.pdf
Many thanks - that is indeed an outstanding project and especially the original report is a better reading than most books on such stories. They really transcribed a huge amount of data and everything manually... One does not really want to know what is possible (and done) today - where there is no need to dig tunnels any more ;-)
