According to Chinese state officials, the quake caused 69,180 known deaths including 68,636 in Sichuan province; 18,498 people are listed as missing, and 374,176 injured, but these figures may further increase as more reports come in.[dated info] This estimate includes 158 earthquake relief workers who were killed in landslides as they tried to repair roads.
Try to answer this question if possible (otherwise reply "unanswerable"): What were the 158 relief workers doing when they were killed?
tried to repair roads