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At the New Almaden quicksilver mine, in California, at a depth of about 600 feet the temperature was very high - some 115 degrees; but in the deepest part of the same mine, 1,800 feet below the surface and 500 feet below sea level, the temperature is very pleasant, probably less than 80 degrees.
Image copyright Image caption The miners became trapped in the San Jose copper-gold mine after a tunnel collapsed on 5 August 2010. Five years ago, one billion people tuned in to watch the successful rescue of 33 Chilean miners who had been trapped underground for 69 days.