You may want to read this regarding tunnel safety against terror attacks or other explosions.
You are also welcome to join the group!
https://tunnelcontact.com/discussion/view/23707/blast-vulnerability-of-drop-ceilings-in-roadway-tunnels
...Hakkari province is in the south east corner of Turkey bordering Iran and Iraq. Yüksekova is known as a place where HDP the political arm of terror organization PKK gets 70% of...
Pakistan has to pay $11.6 million to China. In July 2021, 13 tunnel workers for Dasu Hydropower Project tunnel construction in Kohistan district of Khyber-Pakhtunkhwa p...