In the challenging mission to rescue 41 workers trapped in Uttarkashi partially collapsed tunnel, a significant setback occurred. The US-made Auger machine, a pivotal component in the operation, sustained damage when its blades struck an obstacle. The machine was promptly removed for repairs, but its irreparable state compelled authorities to shift gears.
Transition to Manual Drilling in Uttarkashi Tunnel
Facing a mere few meters between the trapped workers and their rescuers, authorities made a strategic decision to transition to manual drilling. Tunneling expert Arnold Dix confirmed the Auger machine’s demise, stating it is beyond repair. The task of manually clearing the remaining 6-9 meters of debris now falls on heavy-duty drillers.
Auger Machine Breakdown: A Persistent Challenge
Frequent breakdowns of the Auger machine emerged as a persistent challenge, significantly delaying the rescue mission. The machine’s encounters with obstructions forced it to be pulled back 50 meters for intricate repairs, consuming valuable time — a staggering 5-7 hours each time. The decision to adopt manual drilling aims to surmount these technical challenges and expedite the operation.
Ground-Penetrating Radar (GPR) Unveils Uttarkashi Tunnel Insights
Rescuers employed the ground-penetrating radar (GPR) technique to meticulously study the tunnel conditions. The GPR assessment revealed a crucial detail: no heavy objects were detected up to 5 meters inside the tunnel. This information played a pivotal role in shaping the rescue strategy after the Auger machine’s breakdown following an encounter with an obstruction.
Also read: Uttarakhand Tunnel Rescue: Visual Contact Made for Trapped Workers After 10 Days
BRO Enters the Scene: Vertical Drilling on the Horizon
In response to a horizontal drilling obstacle, the Border Roads Organization (BRO) has enlisted to transport machinery that could facilitate vertical drilling. The final decision on this alternative rests with Sutlej Jal Vidyut Nigam (SJVN) and the Oil and Natural Gas Corporation, introducing a potential new dimension to the rescue efforts.
Trapped Workers’ Sustained Well-being Amidst Uncertainty
Trapped since November 12 in the tunnel’s built portion, the 41 workers are being provided with essential supplies. The authorities continue to ensure a steady provision of food, water, medicines, and oxygen. Despite the formidable challenges, officials express optimism about a positive outcome. While refraining from committing to a specific timeframe for the complex rescue operation.
