SILKYARA TUNNEL (India): Indian military engineers were preparing to dig by hand Monday to reach 41 workers trapped in a collapsed road tunnel for 16 days, a rescue operation hit by repeated setbacks.
Soldiers plan to use a so-called “rat-hole mining” technique, digging by hand to clear the rocks and rubble over the remaining nine metres (29 feet), with temperatures plummeting in the remote mountain location in the Himalayan state of Uttarakhand.
Last week, engineers working to drive a metal pipe horizontally through 57 metres (187 feet) of rock and concrete ran into metal girders and construction vehicles buried in the earth, snapping a giant earth-boring auger machine.
“The broken parts of the auger (drilling) machine stuck inside the tunnel have been removed,” senior local civil servant Abhishek Ruhela told AFP on Monday, after a specialised superheated plasma cutter was brought in to clear the metal.
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