The German Stefan Glowacz and the American Chris Sharma were the first persons ever to take a very difficult route out of a cave system.
The two rock climbers began their ascent at the bottom of the world’s second largest cave chamber using a nearly impossible route, and they managed to get out in 12 days.
Extrém.hu reports that the two climbers descended into Majlis al Jinn in Oman to a 160 m depth; from there, they continued the descent to the bottom of the cave. From there, they started to climb up a 250 m tall wall, never climbed before, to reach the only possible exit way.