The Yeti is a custom-made snow-eater that keeps a critical Alaskan airport open for business, and experts reveal how cutting-edge engineering and the latest technology keep this machine running in the toughest conditions.

A special drone uses cutting-edge technology to fly deep into treacherous, hard-to-reach mountains on dangerous search and rescue missions, and a hi-tech ice machine works tirelessly at a Toronto airport to keep flights running in brutal conditions.