Innovative Techniques Lead to Success in Uttarkashi Tunnel Rescue

30 Nov 2023

Employing innovative techniques in a challenging 17 day rescue operation, 41 laborers were successfully extricated from the Silkyara-Dandalgaon tunnel on the Brahmkhal-Yamunotri highway in Uttarkashi district, Uttarakhand.

The 4,531-meter-long Silkyara tunnel is a crucial component of the Chardham Project by the Ministry of Road Transport and Highways. It is under construction by NHIDCL through M/s Navayuga Engineering Company Ltd at a cost of Rs 853.79 crore, holding immense significance in enhancing connectivity in the region.

The challenges posed by a landslide that trapped the workers and necessitated a complex rescue mission, collaborative efforts from multiple agencies, including NDRF, SDMF, ONGC, SJVNL, RVNL, NHIDCL, and THDCL, ensured the safe rescue of the trapped workers.

The rescue operation encountered significant challenges and pivotal turning points, beginning with the implementation of a well-structured five-point plan. This plan encompassed horizontal boring, vertical drilling, and the construction of a rescue tunnel. However, technical setbacks emerged when the auger joint of the drilling machine broke down, prompting the introduction of advanced American auger machines for horizontal digging.

Despite advancing approximately 24 meters through the rubble stretch, the operation encountered another hurdle when the fifth pipe encountered an obstacle.

Persistent technical challenges led to the deployment of another high-performance auger machine from Indore, but unfortunately, this effort suffered a setback when a significant cracking sound emerged from the tunnel.

In a critical decision, rescuers explored alternative methods, including vertical and manual drilling. International tunnelling expert Professor Arnold Dix reported technical malfunctions, necessitating a shift in the drilling approach. Manual drilling, supported by rat-hole mining specialists, became the sixth and final attempt.

A group of 12 rat-hole mining experts undertook the delicate manual drilling process, working meticulously in confined spaces. Amid the challenging operation, locals, and Professor Arnold Dix offered prayers to the deity Baba Bokhnaag at the temple near the tunnel's entrance.

The breakthrough occurred after drilling through 57 meters of debris, with the last 10 meters cleared manually. Collaborating with the NDRF, rescuers inserted a pipe into the tunnel, commencing the evacuation process at 7.56 pm on Tuesday. All 41 workers emerged in good health, marking the successful end of the 17-day ordeal.

Medical preparations played a crucial role, with a specialised ward set up at the Chinyalisaur community health centre, approximately 30 kilometres from Silkyara. Oxygen-supported beds and medical staff were ready, showcasing meticulous planning for any potential health emergencies.

Prayers, both from locals and international expert Arnold Dix, resonated with relief and gratitude following the miraculous rescue of the trapped workers. The Chardham region, known for its spiritual significance, witnessed a harmonious blend of technology, expertise, and faith in the successful outcome of this challenging rescue mission.

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Innovative Techniques Lead to Success in Uttarkashi Tunnel Rescue

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