Hell Hole

Popular Science - - BUILT TO OUTLAST: POPSCI 2018 -

Friendly dis­cus­sions and de­bates on Miller’s farm can end in bot­tom­less pot­holes. This mag­ne­sium-caked bore—gouged by a ¾-inch-wide, 4-foot­long car­tridge—proved to one group that a skinny torch can out­boom a fat one. The ex­plo­sion shook the ground hun­dreds of feet away.

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