An investigation has been launched at a German potash mine after three workers died from breathing in carbon dioxide.<br /><br />The incident happened near the town of Unterbreizbach in the east of the country. The men were aged 24, 50 and 56.<br /><br />Carbon dioxide occurs naturally in potash which is mined using controlled explosions.<br /><br />Mine owner Rainer Gerling explained what happened:<br /><br />...<br />http://www.euronews.net/
