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Vertical drilling may start in the "next 24 to 36 hours" as machines are being placed on a platform on top of the tunnel, he said. About 86 meters of vertical drilling is needed to reach the crust of the tunnel, and thereafter it will be broken to reach the trapped workers, he explained.
Uttarkashi Tunnel Collapse: A community medicine doctor at the Safdarjung Hospital that such a situation may pose physical and mental challenges for the workers
Uttarakhand tunnel collapse update: A 2-metre section of the inserted pipe had to be removed due to compression caused by drilling friction. | Latest News India
Rescue work to reach the 40 trapped workers in the Uttarkashi tunnel has been halted due to a technical snag in the drilling machine.
Rescue efforts to save trapped workers in collapsed Uttarkashi tunnel hindered by stalled drilling machine on Friday. Another high powered drilling machine is airlifted to the accident site from Indore