The walk to Concordia, K-2 BC however, is not a task to be undertaken
lightly. It's a hard trek up and down the gorges, across rushing icy
torrents, through broken rocks, over wire-rope bridges and through
crevasse glaciers.


https://www.couchsurfing.org/activity/view/KV5CHK/k2-base-camp-trek-classic-route-23-days-start-isl