Uttarkashi rescue operation: What is vertical drilling and why it’s safer?
Although there have been glitches in the auger machine previously, the experts now feel that they should not rely solely on the device going forward.
Uttarakhand tunnel collapse: An explanation of the most recent technical issue with auger machine drilling
Update on the collapse of the Uttarakhand tunnel: Drilling friction-induced compression required the removal of a 2-meter section of the inserted pipe.
