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About 10 feet inside Adit 3. At first, I thought it was a cave, but then I saw the timbers. I wonder if you can use some sort of ground-penetrating radar to trace underground mine tunnels?
Jul 16 2015
1/60s f/3.3 at 28mm iso100

Panasonic
DMC-TS5
QuickTime 7.7.1
2015:07:16 11:31:55