Chinese state media on Friday showed images from the amazing rescue of four workers who had been trapped underground for 36 days after their mine collapsed. CCTV footage showed one of the men being pulled to the surface before he was taken to hospital. The four men were detected more than 650 feet below the ground.

Hundreds of workers were involved in the rescue operation, which included tunnelling down to the trapped men and sending them food and water through a narrow borehold, the BBC reported. CCTV footage from a camera sent underground showed the men sitting together, and caught one of them saying he was relieved that he would be rescued. Eventually, they were pulled out using a specially designed capsule.

The collapse at gypsum mine in China’s Shandong province on December 25 was so strong that it registered at local earthquake monitoring stations. The mine’s owner had committed suicide by jumping into a well days after the tragedy, in which 29 people had been trapped. Local agencies said 15 people have now been rescued, one has been confirmed dead and 13 are still missing.