حادثة منجم كوپياپو 2010 - المعرفة - Marefa

Search and Rescue AttemptsHealth of MinersRescue Plansوصلات خارجيةVentilation shaftRescuers attempted to bypass the rockfall on the main entryway through alternative passages but each route was blocked by fallen rock or threatened by ongoing rock movement. A second collapse occurred at the stricken mine on August 7 when rescuers were trying to gain access viExploratory bore holesPercussion drills (rotary hammer drills) were used to make numerous[بحاجة لمصدر] boreholes about 5.5 inches (15 centimeters) wide to find the miners. The rescue effort was complicated by out-of-date maps and several boreholes drifting off-target because of notoriously hard rock that exacer在marefa上AlJazeera Arabic قناة الجزيرة