Gunshot echoes used to map caves' interior
http://dervishcom.blogspot.com/2011/06/gunshot-echoes-used-to-map-caves.html
An acoustic mapping system listens to the reverberations from gunshots to build maps of unknown caves
09 Jun, 2011
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Source: http://feeds.newscientist.com/c/749/f/10897/s/15c653d6/l/0L0Snewscientist0N0Carticle0Cmg210A281560B0A0A0A0Egunshot0Eechoes0Eused0Eto0Emap0Ecaves0Einterior0Bhtml0DDCMP0FOTC0Erss0Gnsref0Fonline0Enews/story01.htm
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Source: http://feeds.newscientist.com/c/749/f/10897/s/15c653d6/l/0L0Snewscientist0N0Carticle0Cmg210A281560B0A0A0A0Egunshot0Eechoes0Eused0Eto0Emap0Ecaves0Einterior0Bhtml0DDCMP0FOTC0Erss0Gnsref0Fonline0Enews/story01.htm
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