2010 Copiapó mining accident San Jose Mine were around 20% higher than at other Chilean mines due to its poor safety record. The collapse occurred at 14:00 CLT on 5 August 2010. Access to the depths of the mine was by a long helical roadway. A group nearer the entrance escaped, but a second group of 33 men were trapped deep inside. A thick dust cloud caused by the rock fall blinded the miners for as much as six hours. Initially, the trapped miners tried to escape through ventilation shafts, but the ladders required by safety codes were missing. Luis Urzúa, the duty shift
Dahlbusch Bomb up or his arms vertical above his head, and not be obese or very muscular. The device was used again on 1956 and 1957, but gained further prominence on 7 November 1963, when eleven miners were rescued after two weeks trapped at a depth of 58 metres (190 ft) in the iron ore mine in Lengede, Germany, in what is known in Germany now as the Wunder von Lengede ("Lengede Miracle"). The "Phoenix" ("Fénix") evacuation devices used in the rescue of 33 miners after the 2010 Copiapó mining accident, in Chile, are an enhanced version of the Dahlbusch Bomb. Dahlbusch