Martin, Andy and Martin, Tom
In the 1970s, these two brothers explored over 100 abandoned mines in the southwestern United States. In Grand Canyon, they explored a few caves and mines, and Andy went on to explore abandon mines in Australia.
In the 1970s, these two brothers explored over 100 abandoned mines in the southwestern United States. In Grand Canyon, they explored a few caves and mines, and Andy went on to explore abandon mines in Australia.
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