The Department of Defense is looking to create an
underground navigation system analogous to GPS. I'm not sure
artificial lightning is a good idea, though. There would be a lot of
temptation to use it even when there is inconvenient civilian
infrastructure in the target area. <http://www.physorg.com/news187512784.html>
An alternative, much more benign and localized underground
GPS system was presented at the ICS/NSS last summer. It requires a
transmitter to actually be in the tunnel of interest,
however. <http://www.isska.ch/En/rechdev/index.php?page=loca_cav>.
Mark Minton
Please reply to mmin...@caver.net
Permanent email address is mmin...@illinoisalumni.org
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