Three experienced climbers rescued from Canada's highest peak last week remember a harrowing week trapped at an elevation of nearly 6,000 metres with extreme wind and temperatures, with a hand-dug snow cave their only means of respite.

Bryce Brown says 160 km/h winds made the descent impossible after reaching the summit of Mount Logan on June 2, in Yukon's Kluane National Park.

The summit, the highest peak in Canada, stands at 5,959 metres. Extreme altitude sickness can occur for most people at heights over 5,500 metres.

"We were actually crawling at one point, just trying to make forward progress," says Brown, who's recovering this week in Canmore, Alta.

Created 'snow cave'

Brown says he knew his party was in trouble when he couldn't see past his hand. The winds were so strong, he feared they would literally be blown off the mountain. 

Mount Logan climbing rescue

Brown says he knew his party was in trouble when he couldn't see past his hand. (Submitted by Bryce Brown)

"Luckily, we found a crevasse on the far side of the pass, and rather than continuing our descent in those conditions, we actually dug into the crevasse and created kind of a snow cave," says Brown. 

The climbers spent the next three days cocooned under two metres of fresh snow, just 200 metres below the summit. 

After tunnelling out of their snow cave, says Brown, they made slow progress down the mountain, descending just a few hundred metres the first day. By June 9, they were still at the 5,300-metre mark, trapped again by stormy weather.

Brown says one of the climbers suffered frostbite. By then, they were all showing signs of altitude sickness.

"Our food and our fuel supplies were dwindling," says Brown, "and so at that stage, we were starting to face the reality that we might not get off the mountain under our own power."

The group then decided to use its satellite phone to call Parks Canada. Two days later, a specialized high-altitude helicopter reached them at their 5,300-metre camp and flew them to safety.

After the rescue, Parks Canada Yukon posted a video of a flyover of the rescue site on Mount Logan.

Everyone is safe and sound: See video from last night's rescue of climbers from Mt. Logan in Kluane National Park and Reserve. Parks Canada is proud of its visitor safety team who are as always a very impressive and professional group.

Posted by Parks Canada Yukon on Friday, June 12, 2015

"It was fantastic," says Brown of the rescue. "If the weather hadn't cleared to allow the helicopter evacuation, within a few days, we would have been in serious trouble."