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An estimated 86 metres of vertical drilling is required to reach the tunnel's crust, after which it will be breached to access the trapped workers. | Latest News India
The rescue operation has been hampered as a section of the auger machine broke and became lodged in the tunnel, causing a slowdown in progress.
The NDMA member further said a very difficult operation is going on. Two methods are being used currently, but a third method that is drift method could also be used soon. Currently, 47-meter horizontal drilling has been completed, he said, adding the broken part of the auger machine has to be removed, and the drilled structure has to be kept stable.
Authorities are considering alternative plans to evacuate the 41 workers trapped in the collapsed Silkyara-Barkot tunnel in Uttarakhand. | Latest News India
Rescue operations to save 41 construction workers trapped in a tunnel in India has stalled again as the drilling machine has broken down.