Drilling had penetrated through about 21 metres (70 feet) of
debris, Devendra Singh Patwal, a disaster management officer,
told Reuters.
They have to cover a total distance of nearly 60 meters.
Another officer with the rescue team inside the tunnel said the
trapped men were doing fine.
The workers have been supplied with food, water and oxygen
through a pipe and authorities have been in contact with them
via walkie-talkies.
The 4.5 km (3 mile) tunnel in the northern state of Uttarakhand
is part of the Char Dham highway, one of the most ambitious
projects of Prime Minister Narendra Modi's government.
Authorities have not said what caused the tunnel to cave in on
Sunday morning, but the region is prone to landslides,
earthquakes and floods.
(Reporting by Saurabh Sharma, writing by Tanvi Mehta and Raju
Gopalakrishnan)
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