Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The Anzob Pass to the south, about 90 kilometres (56 mi) north of Dushanbe at roughly 11,000 feet (3,400 m), is one of the most treacherous mountain passes of Central Asia. On October 23, 1997, an avalanche killed 46 people, burying 15 trucks and cars. The avalanche was so large that it took two weeks for the would-be rescuers to reach the victims. Due to the importance of the route connecting the north to south and its level of danger, the 5 kilometres (3.1 mi) Anzob Tunnel was built, completed in 2006. Construction was delayed due to electricity faults and other problems.