At least 52 people lost their lives in Russia's worst mining disaster for a long time. A gas leak in a Siberian coal mine was reported on November 25. Six rescuers who were sent down to try to bring out dozens of men, were also killed. This is regarded as one of Russia's worst mining disasters in a decade.  11 miners, 35 who had been reported missing, and the six rescue workers have been declared dead. Watch the video to know more.
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