Forty-one construction workers trapped for 11 days will have to wait another day before an attempt to rescue them from a collapsed tunnel in northern India can continue.

That’s because the drilling machine used in the rescue hit a lattice steel girder arch that took six hours to remove, said Bhaskar Khulbe, a tunnel project official, to The Associated Press.

The machine is expected to be fixed by Friday, when the rescue attempt can continue to free the workers who have been trapped for nearly two weeks. On Nov. 12, a landslide caused a portion of the 4.5-kilometre tunnel they were building to collapse about 200 metres from the entrance.