http://www.dailymail.co.uk/news/article-2071056/The-human-icicle-Climbers-hang-upside-to-scale-450ft-Canadian-waterfall.html

This is the chilling moment two daredevils scale a 450ft waterfall
covered in dangling icicles while upside down.

Will Gadd, 44, and Tim Emmett, 37, spent two weeks meticulously plotting their
ascent of the notoriously tricky Helmcken Falls in Canada - ominously dubbed the
world's hardest climb.

They had to battle deadly ice spray - which could freeze them to death in
minutes - temperatures as low as minus 25C and the knowledge that one mistake
would send them plunging into a 100ft deep ice hole below.