Tunnels humble you!
Tunnel is never a child's play. It is a kind of anti-engineering work. Having lived through close to a hundred of them walking through collapsing or likely to collapse ones, I feel if I have to do again one more, it will be with the same level of humility and anticipation of meeting the umknown if the strata is not regular hard rock. Finally I told the UN expert in tunnels who rushed out in panic while visiting the last tough Pernem soft soil tunnel, leaving me behind, that all methods failed and we are completing the tunnel using "rat" technique! My guru also abandoned me to as he wanted to do more imp work and left giving me a piece of advise to change the alignment in 1997. So kept a liquid nitrogen gas tanker with own designed pipe systems stayed with workers and it was sheer motivation and inspiration of humans which made that tunnel. The tanker was more a show piece that we also are pumping liquid nitrogen etc. To help keep morale high. Repeated collapses drain a...