On the 5th of August in Chile, 33 miners were trapped 2300 ft (700m) underground after a huge cave-in. The miners tried to escape via the ventilation shafts, but there were no ladders; rescuers tried every entrance but all were blocked by rocks and debris.

During their time in the mine, the miners lived in a tunnel with very limited food supplies. After 14 days, rescuers started sending supplies and letters from their loved ones via 5-foot-long plastic capsules. Steel rescue capsules were constructed by the Chilean Navy, incorporating NASA’s designs and suggestions. These were eventually used to rescue the miners, 69 days after they were first trapped by the cave-in.
P. S. I really recommend you to see the below-mentioned video related to the escape. It is a real miracle that they’ve survived. Nobody thought that they’ll be saved after many unsuccessful attempts. The only minus is that the video is in Russian.