PTI
Rescuers at Silkyara tunnel have crossed the 50-metre mark and they need to dig through around 10 metres of rubble using rat-hole mining technique to bring out the 41 workers trapped there for the last 16 days.
Twelve rat-hole mining experts are involved in the horizontal excavation 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.
This drilling was earlier carried out by a huge auger machine that got stuck in the rubble on Friday at around 47 metres.
