Forty workers remain trapped inside a partially collapsed tunnel under construction in northern India, and rescuers are struggling to get them out.
The tunnel in the state of Uttarakhand caved in on Sunday morning.
Rescuers are using heavy machinery to remove rubble, but it is a slow process as more collapses have occurred.
They say they are in radio contact with the workers, and that all of them are safe. But there are concerns about the workers' health.
Colleagues of the trapped workers who are frustrated with the situation staged a protest.
They said the incident happened because safety measures were lax and asked why no one has been rescued.
Local authorities say they are stepping up rescue efforts by introducing another drilling machine.