1 year, 4 months ago

Uttarkashi tunnel collapse: From rat-hole mining to vertical drilling, methods used to rescue 41 workers

Uttarkashi Tunnel Collapse: India's biggest evacuation operation to rescue 41 trapped workers inside the Silkyara tunnel in Uttarakhand, who have been stuck for the last 16 days, is in the final stage and the evacuation of the stranded labourers is expected to begin very soon. Horizontal drilling approach to reach trapped labourers Horizontal drilling using the American auger machine was conducted to reach the trapped workers inside the Silkyara tunnel. Vertical drilling from atop tunnel Since, the American auger machine faced continuous technical glitches and finally broke down when it had drilled up to 56 meters, an alternative way to reach the trapped labourers was to create a vertical escape tunnel from atop the mountain. Workers provided with food, medicines Rescue teams took full care of trapped workers inside the Silkyara tunnel as they were continuously provided with fresh food, medicines, board games to divert their minds.

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