Science Channel HD A helicopter made for extreme environments aids US Army rescue efforts in some of the most harsh conditions; a trio of small but capable tugboats moves cargo vessels through the busiest port of Alaska. 2026-06-10 The Yeti is a custom-made snow-eater that keeps a critical Alaskan airport open for business; experts reveal how cutting-edge engineering and the latest technology keep this machine running in the toughest conditions. 2026-06-10 When melting ice threatens to flood a town, a 22-ton amphibious mega machine battles the elements to save the day; in the Arctic, the Canadian Air Force relies on a massive transport aircraft to deliver supplies and personnel to far-off places. 2026-06-10 A deadly tragedy on a freeway in Oklahoma sends one of the state's busiest bridges collapsing into the Arkansas River below; expert engineers investigate how a tugboat striking a reinforced concrete pier could cause such a catastrophic disaster. 2026-06-10 Catastrophe strikes as one of America's most vital freeway intersections erupts in flames and completely collapses in San Francisco; experts use the latest science to investigate how an overturned tanker truck spawned a devastating inferno. 2026-06-10 Construction turns catastrophic in New Orleans when the side of a hotel complex collapses on a busy street below; expert engineers investigate to uncover the reason behind this sudden and fatal disaster. 2026-06-11