The former main foreman, Alain Kreutzer, showed as contemporary witness from his own experience at the MNM-Conference many listeners how things went on in a tunnel. Almost all aspects were touched: from working with hand tools to the use of modern drills to the dangers to which the miners were exposed at times. Alain Kreutzer is well placed to report on the world of Lorraine iron miners. He went through all the stages, whether in production, in the workshop or as a “chef-porion” at the “Terres Rouges” mine.