Duncan Collis and Erin Lynch walk through a section of cave in San Wang Dong called The Sea of Tranquility. Here remains of old Nitrate mining cover the floor in forms of harths - pits and unwanted spoil.
How was a cave previously used for mining considered undiscovered?
3 posted on 10/10/2013 1:16:26 PM PDT by thackney
(life is fragile, handle with prayer)
