yeah the ferret ( my jill ) is doing the job she goes down 4 a good 8- 13 min down 1 hole out of another net there r 6 sets there not linked all have fresh scraping on the earth & fresh dropings so the signs r there but no bolts, i put the locator on and in 30 seconds its gone straight past 16ft ,im going to just keep trying them all till i get a result , i hope ....