WATCH: Canadian climber tackles frozen Niagara Falls

Unsuspecting visitors to Niagara Falls were treated to quite the sight Wednesday.

Pro climber Will Gadd was spotted ascending a treacherous 54-metre frozen wall on the American side of Niagara Falls .

Gadd, dubbed “The Captain of Adventure,” is a Red Bull athlete, which was filming the stunt.

He described the history-making ascent to Red Bull.

“The massive water flow constantly shakes the ground, and makes the ice shelves and walls around you unsteady and unpredictable,” Gadd said. “It’s a harsh environment and an intense challenge to stay attached to the wall, let alone climb it.”

WATCH: Bystanders were surprised to see Will Gadd ascending a frozen wall in Niagara Falls.

According to reports, the New York State Parks Police initially said that the climbing was just a part of their “training exercises,” but later admitted that they were on site for the Will Gadd/Red Bull film project.

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The 47-year-old athlete from Canmore, Alberta posted this picture of himself nearing the peak of the wall earlier on Thursday.

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