Uttarkashi Tunnel Rescue: Rat-hole Mining Rescuers Begin Drilling, Vertical Boring Makes Headway | Key Updates

uttarkashi tunnel rescue: rat-hole mining rescuers begin drilling, vertical boring makes headway | key updates

Uttarkashi: Rescuers have fallen back on the rat-hole mining technique to evacuate 41 labourers trapped in a tunnel in this Uttarakhand district for 15 days, following the failure of a heavy machine to drill through the rubble to create an escape passage for them.

Rat-hole mining is often associated with Meghalaya, where holes are drilled for mining small amounts of coal.

Rescuers had bored 36 metres into the hill above the Silkyara tunnel by Monday evening in their effort to reach 41 workers trapped inside for 15 days as rat-hole mining experts also reached the disaster site to help tackle the challenge simultaneously from another front.

Twelve rat-hole mining experts will be involved in manual drilling and excavation horizontally through the last 10- or 12-metre stretch of debris of the collapsed portion of the under-construction tunnel on Uttarakhand’s Char Dham route.

They have come from Delhi, Jhansi and other parts of the country.

“They will have to drill at least 10 to 12 metres with their own hands. They will mostly use two tools — hand-held drilling machines to remove the rubble and gas cutters for cutting the iron hurdles,” an official said.

According to Neeraj Khairwal, Additional Secretary, Uttarakhand government and the state nodal officer for the rescue operation, a skilled team of workers called to apply the rat-hole mining technique will remove the rubble with their hand.

“As they remove the muck, the tunnel pipe (800-mm) will be pushed gradually by the machine through the rubble,” Khairwal said.

“We will do the drilling and collect the muck with our hand. We have been doing this for years,” one of the workers, Mohan Rai, told PTI.

He said they will be in proper gear, wearing oxygen masks and glasses to cover their eyes.

“We can remove five-six metres of rubble using this method in 24 hours,” Rai said.

Rakesh Rajput, another expert, said three of them will go inside the tunnel, one will do the drilling, another will collect the muck and the third one will push the muck through the trolley.

Another expert in the rat-hole mining technique said they can remove 10 metres of muck or rubble in 20 hours.

(Inputs from PTI)