Production is like being on thin ice at times, and sometimes actually. This shoot in Banff on a frozen lake took a whole gang of people to make sure we were safe, that the ice was thick enough to hold us (on what turned out to be the last day of the season we could have shot cos it was melting), creating a circular track through the snow, and constantly checking the ice. We got it done and the grappling hook was never used. :)