The trapped men are safe and healthy, the authorities said, and are being supplied food, water and oxygen through a pipe. Officials are in regular contact with them.
The 4.5km tunnel, which was being built in Uttarakhand state on a national highway that is part of the Char Dham Hindu pilgrimage route, caved in on Sunday.
There were about 50 to 60 workers on the night shift and those near the exit of the tunnel got out, while the 40 who were deeper inside were trapped, one worker able to leave the tunnel told local media.
"This is a very challenging job because as we clear debris, more debris is falling from the ceiling, so we are also trying to stop that by using cement," Mr Mohsen Shahidi, a senior National Disaster Response Force officer, told news agency ANI.
The debris covered an area of 40m and the 40 men were stuck in an area of about 50m to 60m, Mr Shahidi said.
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