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Ostrava city and Karvina city has a long history of mining. Over time in Ostrava there has been a decline in mining activity. But closed coal mine may be performed in the correct disposal of heavy burden on their surroundings. One of the biggest dangers are the outputs of mine gases. If gas leaks into a confined space, there is an accumulation of gas and may result in an explosion. The article presents two cases of methane explosions, which were noticed in the Ostrava-Karvina coalfield. Such an explosion had a dev...