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The entrance to an opal mine in Coober Pedy, Australia

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The underground St. Peter and St. Paul Catholic Church

The Catholic St. Peter and Paul Church, built in 1967, is one of five underground churches in the town of Coober Pedy in the Australian Outback.
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The mining town of Coober Peny

Ever since the town was settled in 1915, after opals were first discovered there, its inhabitants have sought relief from the heat in the same place they seek their quarry— underground.
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The interior of the underground Catholic St. Peter and St. Paul Church in Coober Peny, Australia

Worshipers -- and tourists -- find an escape from the extreme heat in the town's underground churches.
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A side altar at the Catholic St. Peter and St. Paul Church in Coober Pedy

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Tourists "noodling" for opals in Coober Pedy