Rescue personnel work at the mouth of the collapsed under construction Silkyara tunnel in the Uttarkashi district of India's Uttarakhand state, on Nov 24, 2023. (PHOTO / AFP)

SILKYARA, India - Hopes for the imminent rescue of 41 men trapped in a highway tunnel in the Indian Himalayas for nearly two weeks were dashed by a problem with the drilling equipment, officials said on Friday, but efforts to reach the workers should resume soon.

The men, construction workers from some of India's poorest states, have been confined in the 4.5-km tunnel in Uttarakhand state since it caved in early on Nov 12. Authorities have said they are safe, with access to light, oxygen, food, water and medicines.

Attempts to pull them out by drilling through the debris of rock, stones and metal and pushing through an evacuation pipe have been slowed by snags.

Rescuers had hoped to finish the drilling late on Thursday but had to suspend it after the platform on which the auger machine is placed was damaged, and subsequently a metal pipe was found stuck to the machine, requiring it to be reassembled, according to a government statement

Rescuers had hoped to finish the drilling late on Thursday but had to suspend it after the platform on which the auger machine is placed was damaged, and subsequently a metal pipe was found stuck to the machine, requiring it to be reassembled, according to a government statement.

An estimated 15 meters of the debris pile is left to be drilled through and a study using ground penetration radar shows there is no metallic obstruction for the next 5 meters, said Bhaskar Khulbe, a senior tunnel project official.

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"We have a very big positive in that," Khulbe told reporters. "This means our drilling should be smooth ... and we are much more hopeful," he said, adding that drilling should resume by 11:30 am (0600 GMT).

The rescue plan involves pushing a pipe wide enough to pull the trapped men out on wheeled stretchers. Rescue workers rehearsed the evacuation by going into the pipe and being pulled out on stretchers, a video clip provided by authorities showed.

A second plan to drill vertically from atop the hill is also being pursued and the drilling machines are being assembled, according to the statement.

The men have been getting cooked food since a larger lifeline pipe was pushed through earlier this week and the statement showed they were sent 200 rotis or Indian round flat bread, lentils and mixed vegetable curry.

A number of heavy machinery are seen parked at the entrance to the site of an under-construction road tunnel that had collapsed trapping 40 workers in Silkyara in the northern Indian state of Uttarakhand on Nov 22, 2023. (PHOTO / AP)

More than a dozen doctors, including psychiatrists, have been at the site, talking to the men and monitoring their health.

They have been told to do light yoga exercises, walk around in the 2-km space they have been confined to, and keep talking to each other. Rohit Gondwal, a psychiatrist, told Reuters they were also considering sending playing cards and board games such as ludo and chess.

READ MORE: First images from Indian tunnel show workers trapped for 9 days

The collapsed tunnel is on the Char Dham pilgrimage route, one of the most ambitious projects of Prime Minister Narendra Modi's government.

It aims to link four key Hindu pilgrimage sites with 890 km of two-lane road, at a cost of $1.5 billion.

Authorities have not said what caused the tunnel collapse, but the region is prone to landslides, earthquakes and floods.