Rat Hole Mining Technique To Rescue 41 Trapped Workers In Uttarakhand

Rat hole mining is a traditional method that rescuers have fallen back upon to evacuate the 41 workers trapped in a tunnel in Uttarakhand, India. The workers have been trapped for the last 15 days following the failure of heavy machines, including the American auger, to drill through the rubble and prepare an escape passage.

In the wake of the tragic collapse of a tunnel in Uttarakhand, India, which left 41 workers trapped for over 15 days, rescuers have turned to a traditional method known as rat hole mining in an attempt to evacuate the survivors. Rat hole mining is a technique commonly used in Meghalaya, India, where workers drill small holes in the earth to extract coal.

Experts Called In

To carry out the rat hole mining operation at the Silkyara tunnel, at least 12 experts have been brought in by the companies involved in the rescue efforts, Trenchless Engineering Services Private Limited and Navayuga Engineers Private LTD. These experts have come from various parts of the country, including Delhi and Jhansi, and possess the necessary skills and experience to execute this specialized mining technique.

The Process

Rat hole mining involves drilling horizontal holes into the collapsed section of the main tunnel. The workers will need to manually drill through at least 10 to 12 meters of debris and obstacles. To accomplish this, they will primarily use two tools: a hand-held drilling machine to remove the rubble and a gas cutter to cut through any iron hurdles they encounter.

Skilled Workers

According to Neeraj Khairwal, Additional Secretary of the Uttarakhand government and the state nodal officer for the rescue operation, a skilled team of workers has been called in to carry out the rat hole mining. These workers will manually remove the rubble, creating a path for the tunnel pipe, which has a diameter of 800 mm. The pipe will be pushed through the debris gradually as the rubble is cleared.

Challenges and Risks

Working in a collapsed tunnel presents numerous challenges and risks for the rescue workers. They must wear proper protective gear, including oxygen masks and glasses, to ensure their safety. The drilling and removal of debris can be physically demanding, requiring the workers to toil continuously to clear a significant amount of material. Despite the challenges, the workers remain determined and focused on their task.

Progress and Expectations

Using the rat hole mining technique, the workers aim to remove 5-6 meters of rubble within 24 hours. Rakesh Rajput, one of the experts involved in the operation, explained that a team of three workers will work in rotation inside the tunnel. One worker will operate the drilling machine, another will collect the debris, and the third will transport the debris using a trolley.

With their years of experience, the rat hole mining experts believe they can remove approximately 10 meters of debris or rubble within 20 hours. Their efforts are crucial in creating a safe passageway for the trapped workers, bringing them closer to a successful rescue.

As the rescue operation continues, rat hole mining stands as a testament to the resilience and ingenuity of the human spirit. With skilled workers and a determination to save lives, this traditional method offers hope for the safe evacuation of the trapped workers. Every meter of progress brings them closer to freedom, and the nation stands united in solidarity, praying for their swift and successful rescue.