The tunnel was part of the Char Dham highway project, an ambitious effort to connect four sacred Hindu pilgrimage sites in Uttarakhand with modern, all-weather roads. But the Himalayas are among the youngest mountain ranges on Earth, still being pushed skyward by the collision of the Indian and Eurasian tectonic plates. This particular stretch sits near the Main Central Thrust, a major geological fault zone where the rock is a treacherous mix of meta-siltstone and phyllites - weak, fractured, and unpredictable. The original project tender had not fully anticipated the difficulty of tunneling through such terrain. Investigators later found that the tunnel alignment crossed a geological fault, that no emergency escape shafts had been built, and that the contractor had failed to adequately address 21 previous minor collapses flagged by the supervising authority engineer. The ground had been warning them.

The state government named its rescue effort Operation Zindagi - 'Life' in Hindi and Urdu. Within hours of the collapse, the National Disaster Response Force, the Indian Army Corps of Engineers, and the Border Roads Organisation converged on the site. Three narrow pipes were drilled through the debris early on: one for oxygen, one for food, and a six-inch line through which rescuers pushed hot meals and threaded an endoscopic camera to monitor the workers' condition. The trapped men could be seen and spoken to, but reaching them physically proved far more difficult. A horizontal drilling machine was disassembled in Delhi and flown to the site in three parts on 16 November after the first machine's progress stalled. The team even contacted the Thai specialists who had led the 2018 Tham Luang cave rescue, seeking any edge that experience could offer.

The debris inside the tunnel was not uniform rock - it was a chaotic jumble of different materials, some soft enough to collapse around drill bits, others hard enough to break them. On 17 November, cracking sounds forced a halt to drilling. The delays compounded: obstructions on the 22nd and 23rd, a broken mounting platform, and then on the 25th, the drilling machine itself broke and became stuck after reaching 47 meters - roughly nine meters short of the trapped workers. Australian tunneling expert Arnold Dix, who had been called in by the Indian government as a consultant and who spent days and nights outside the tunnel alongside the crews, urged caution. Multiple agencies simultaneously drilled vertical shafts from the hilltop above, hedging against the horizontal approach's failure. The Border Roads Organisation had already built a 1.15-kilometer road up the hillside to enable this backup plan.

With the drilling machine jammed and the breakthrough tantalizingly close, the rescue effort turned to an older technology entirely: human hands. Rat-hole mining - a traditional manual method practiced in parts of northeastern India - involves miners crawling into narrow passages and breaking rock with simple tools. It is dangerous, physically brutal work, and India had actually banned the practice in coal mines on environmental and safety grounds. But in the Silkyara tunnel, these miners possessed exactly the skills no machine could replicate. Working with hammers, chisels, and bare determination, the rat-hole miners pushed through the final meters of debris on 28 November and drove a rescue pipe to the trapped workers. One by one, on stretchers, the 41 men were pulled through the narrow passage. By 8:50 that evening, every worker was out.

The rescued workers were airlifted by Indian Air Force Chinook helicopter to AIIMS Rishikesh the following day. Forty of the 41 were declared fit and cleared to go home by 1 December - a remarkable outcome after more than two weeks underground. The investigation that followed was less triumphant. A detailed probe found negligence by the construction firm Navayuga Engineering, the National Highways and Infrastructure Development Corporation that prepared the project report, and the supervising authority engineer. The tunnel alignment had violated fundamental principles of tunneling, and repeated warning signs had been ignored. As of April 2025, the two ends of the Silkyara tunnel finally met in a breakthrough, and the tunnel is expected to open within a year. The 41 workers who survived its worst moment will not be building it.