Since there was no mobile phone network inside the tunnel and their walkie talkies were not working properly, they came up with an improvised plan to send a signal to the outside.
Two days after relentless hard work, labour, and heartfelt prayers brought the 41 trapped men out of the Silkayara tunnel site in Uttarkashi, international tunnelling expert Arnold Dix appreciated the efforts of the rescue teams.
Uttarkashi tunnel collapse: Top National Highways Infrastructure Development Corporation Ltd (NHIDCL) official said the geology of the region where the 4.5 km-long tunnel is located is responsible for the recurring collapses