Boring Operations Halted Thrice as Hurdles Mount
The ongoing rescue mission at the Silkyara tunnel site faces yet another setback as the bore operations have been halted for the third time in 15 days. This time, the hindrance arises from cracks in the platform supporting the drilling machine. The hurdles have further delayed the efforts to rescue the 41 workers trapped inside the collapsed tunnel in Uttarkashi.
Auger Machine Woes Continue
The auger machine, a critical component in the drilling process, has encountered persistent issues throughout the rescue mission. Its operation was briefly suspended earlier to address an obstruction caused by an iron girder. However, cracks in the platform have now brought the drilling to a standstill once again. This marks the third interruption in the drilling exercise since the mission's commencement on November 12.
Unforeseen Obstacles and Vibrations
During the recent drilling phase, unforeseen complications arose, leading to the suspension of operations. Officials cite the appearance of cracks in the platform structure as the reason for the temporary pause. Although not officially confirmed, efforts are underway to stabilize the platform. Minor vibrations were reported at 1.10 pm, prompting a cautious reassessment of the drilling force before resuming the operation.
Optimism Amidst Challenges
Prior to the latest setback, officials expressed optimism about completing the operation on Thursday night, anticipating a smooth drilling process in the final 10 to 12 meters. However, with recurring hurdles, the timeline remains uncertain. Lt Gen Syed Ata Hasnain from the National Disaster Management Authority (NDMA) acknowledged the challenges and potential delays but remained hopeful about the mission's success in the coming hours or days.
Auger Machine and Manual Drilling Struggles
The auger machine, weighing 25 tonnes, has been grappling with structural challenges, including breakdowns caused by metal rebars. The option of manual drilling is under consideration, although it may prolong the rescue timeline. Horizontal drilling, initially the primary approach, has encountered numerous setbacks, prompting authorities to explore the viability of vertical drilling.
Strategic Shift to Vertical Drilling
In response to persistent challenges with horizontal drilling, the rescue team is evaluating a strategic shift to vertical drilling. This alternative approach aims to expedite the creation of an escape route for the trapped workers. As authorities work to stabilize the platform and address structural concerns, the vertical drilling plan is being formulated as a contingency to overcome the hurdles faced in the ongoing rescue mission.
Uttarkashi Tunnel Rescue Day 15: Rescuers Plan Manual Digging
After the drill blade broke on Saturday, causing a major setback, rescuers are planning to manually dig through the remaining debris to reach the 41 workers trapped for 15 days. The plasma cutter from Hyderabad has been brought in to cut and remove the drill blade. Additionally, vertical drilling has commenced as another option to reach the trapped workers. The Satluj Jal Vidyut Nigam (SJVN) has drilled around 19.2 meters of the alternate vertical passage. Manual digging, though time-consuming, is considered the safest option. The trapped workers remain healthy and are in communication with relatives, receiving necessary supplies through pipes. A unit of the Madras Sappers has joined the rescue operations.
Alternate Rescue Plans Underway
In addition to manual digging and vertical drilling, alternative plans are in place for the rescue operation. Horizontal drilling perpendicular to the tunnel from the left side of the hill is set to begin on Tuesday, requiring approximately 14 days to complete. Rail Vikas Nigam Limited (RVNL) will undertake this work, creating a future escape tunnel. Tehri Hydro Development Corporation (THDC) has initiated horizontal drilling from the Barkot end, expected to take 35-40 days. Special sensors monitor vibrations as work progresses from different sides of the hill.
The intricate operation continues to unfold, with the dedicated efforts of multiple agencies striving to surmount the challenges and bring the 41 trapped workers to safety. The evolving situation necessitates adaptability and strategic planning to navigate the complexities of the rescue mission in Uttarkashi