How Niagara Falls freezes ... or does it?

Visitors look over masses of ice formed around the American Falls, US, Feb 19, 2015. [Photo/IC]

Their story is the subject of an online graphic novel, He cock, named for the teenager who died.

Walking anywhere on the ice has been banned ever since. But an exception was made last month for two Canadian ice climbers, Will Gadd, 47, and Sarah Hueniken, 34, who became the first to scale the falls, climbing a 9-meter section of the Horseshoe Falls.