Chenani-Nashri tunnel is India's longest, and safest

Chandwar, who was earlier with the National Highways Authority of India, said the tunnel also has a special drainage system to flush out water flowing in from the mountains and to use it for fire fighting and construction activities. "This tunnel is completely dry, which means not a single drop of water will be present in the entire tunnel. To make it dry we have put a water proofing membrane behind the concrete walls. Behind the membrane there is a system which collects the water coming out from the mountains and takes it to a central drain. Once collected the water is saved for captive use such as fire fighting and construction activities. This water is rock water so it is completely safe for drinking as well," said Chandwar.