In 2018 the era of the coal industry in Germany will come to an end. The three-part book series "Unter Uns" pays tribute to the last decades of the coal industry in the area Ruhr and Saar. The volumes are filled with impressive pictures and images, eyewitness reports, the speeches of public figures and naturally formulated experts contributed to the fascinating world deep beneath our feet. This first volume, which presents the accumulated "knowledge and skills" in the coal industry, was released on October 16th, 2015.