The construction of the Atal Tunnel connecting Manali with Leh, which is the world's longest highway tunnel above 10,000 feet, has been completed in a span of 10 years. The 9-km horseshoe-shaped single-tube, double-lane tunnel has many firsts and will shorten the distance by 46 km.
Here are the interesting things
1. This is the first tunnel in India to deploy the Rowa flyer technology, which allows engineers to work at inverted levels.
2. The tunnel consumed 14,508 metric tons of steel and 2,37,596 metric tons of cement
3. Using the drill and blast technique, 14 lakh cubic meters of soil and rocks were excavated.
4. It is the country's first tunnel to have an escape tunnel within the main tunnel because of the topography.
5. The tunnel provides a telephone facility at every 150 meters, a fire hydrant every 60 meters, emergency exit every 500 meters.
6. It also has an air quality monitoring system after every km.
7. Broadcasting system and automatic incident detection system with CCTV cameras at every 250 meters.
8. The tunnel will have a semi-transverse ventilation system, where large fans would separately circulate air throughout the tunnel length.
9. Thickness of the concrete lining is 50 cm.
10. At 10.5 meters wide and a height of 5.52 meters, a car can zip through at 80 kmph.
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