system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How are steep and difficult mountains like K2, Annapurna, Jannu climbed for the first time without ropes, ladders and harnesses from above for support?
gpt
The first climber is climbing above their gear, setting new anchors and hooking into them. The last climber in the team removes the anchors. If anyone falls they will be caught by the other team members through the anchors along the route.