For 10 years, ski mountaineer Andy Traslin toiled in construction safety at British Columbia’s Vancouver Shipyards,at the base of the North Shore Mountains. In winter and spring, the same slender line of snow, dropping like a dagger from Crown Mountain, would tempt him. Barely a ski-length wide, everything about the project was burly. Finding the entrance was challenging, and exiting the gully was equally risky. Inspired by his heroes, Eric Pehota and Trever Petersen, he did it anyway.