A high-altitude tunnel hailed as the world’s longest at more than 3,000 metres above sea level cuts a seven-hour journey in half by carving through a mountain range. Spanning 13.5 miles, the colossal Tianshan Shengli Tunnel forges its way through the Tian Shan Mountain range in northwest China's Xinjiang Uygur Autonomous $egion. China ’s five-year project, part of the Urumqi–Yuli Expressway, aims to boost connectivity between the mountainous regions of northern and southern Xinjiang. It