The Muon Detector is of course not used solely for finding the arches and is most often used for finding the other easter eggs on the Mün, Kearth, and Minmus. I haven\'t spent a lot of time looking for the ones on Kearth, though that\'s next. I\'ve just about covered everything I can on the Mün. 1st: 2.424 North / 81.444 East 2nd: 12.471 North / 39.261 East 3rd: 12.454 South / 140.826 West (750 meters underground from my best calculations) You should really try to find them yourself before resorting to just being told though, it\'s much more fun Nifty… thanks for the link to the Muon detector. Also, it\'s Kerbin, not Kearth.