Officials said the miners were clearing about eight tons of rock every 12 hours to keep the mine shaft clear.

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The workers at Rudna copper mine in Lower Silesia were trapped for about eight hours while rescuers dug through earth and rock to reach them.

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Posner, a prolific ultramarathoner currently in training for a 200-mile race in Vermont this year, wanted to broaden the scope of distance running and walking by opening the time frame for Rock the Ridge to 24 hours.

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Put to the test last year, the superhard coating was applied to plates on a 20-ton mining rock-crusher and reduced jagged boulders to pebbles for 48 hours before wearing out.

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We'd spend hours picking through the best of them, finding the perfect rock to skip across the river.

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He's also an avid concert-goer and will travel around much of California to see his beloved hard rock bands, often taking long late-night trips over many hours on freeways.

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