Rescuers work at the explosion site of a gold mine in Qixia City, east China's Shandong Province, Jan. 17, 2021. Twenty-two workers have been trapped underground after an explosion ripped through the gold mine that was under construction in east China's Shandong Province. Rescuers have drilled a hole from the ground to the tunnel where the trapped workers are located. (Xinhua/Wang Kai)

Rescuers work at the explosion site of a gold mine in Qixia City, east China's Shandong Province, Jan. 17, 2021. Twenty-two workers have been trapped underground after an explosion ripped through the gold mine that was under construction in east China's Shandong Province. Rescuers have drilled a hole from the ground to the tunnel where the trapped workers are located. (Xinhua/Wang Kai)

Rescuers work at the explosion site of a gold mine in Qixia City, east China's Shandong Province, Jan. 17, 2021. Twenty-two workers have been trapped underground after an explosion ripped through the gold mine that was under construction in east China's Shandong Province. Rescuers have drilled a hole from the ground to the tunnel where the trapped workers are located. (Xinhua/Wang Kai)

Rescuers work at the explosion site of a gold mine in Qixia City, east China's Shandong Province, Jan. 17, 2021. Twenty-two workers have been trapped underground after an explosion ripped through the gold mine that was under construction in east China's Shandong Province. Rescuers have drilled a hole from the ground to the tunnel where the trapped workers are located. (Xinhua/Wang Kai)