John Cantor and Evan Howard's winter Brooks Range crossing
Credit: Getty Images

After successfully crossing Alaska's Brooks Range in 2012, Aussie John Cantor decided the journey wasn't hard enough for his liking. Now he's doing it again, in winter. If that doesn't sound like a substantially different expedition, keep in mind that temperatures are likely to drop to around 150 degrees below zero with wind chill. Joined by adventurer pal Evan Howard, Cantor expects to finish the nearly 1,000-mile traverse in about two months, dragging more than 100 pounds over the jagged mountains. Cantor suffers from anxiety and is using the hike to raise money for mental health nonprofit Beyond Blue. The duo departed on January 7, when the area was enjoying five hours of sunlight a day.