Pretty impressive use of drones (both areal and submersible) to map out
an abandoned mine:
https://accesswdun.com/article/2020/9/941123/drone-technology-uncovers-the-history-of-a-north-georgia-mine
--
Clark Jorgensen
Big Sky Geophysics
P.O. Box 353
Bozeman, MT 59771 USA
+1 (406) 587-6330 office
+1 (406) 580-9718 mobile
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