A mining practice banned for being unsafe has come to the aid of the 41 workers trapped inside an Uttarakhand tunnel after high-tech, imported machines broke down during the long-drawn operation.

Rat-hole mining to rescue the trapped workers began yesterday after a 25-tonne auger machine failed in the last leg of the challenging operation. This method of manual drilling has made quick progress and the diggers are now metres away from the workers who have been confined for 17 days.

Rat-hole mining is a method of extracting coal by digging very small pits, not more than 4 feet wide. Once the miners reach the coal seam, tunnels are made sideways to extract the coal. The coal brought out is dumped nearby and later transported via highways. In rat-hole mining, workers enter the mines and use hand-held tools to dig. This is the most common method of mining in Meghalaya, where the coal seam is very thin and any other method risks being economically unviable. The small size of the tunnels make children the best fit for the hazardous job, and in a state that has limited options for livelihood, many line up for the risky job. Many children also pose as adults to get work in such mines.

The National Green Tribunal banned rat-hole mining in 2014 for being unscientific, but the practice continues to be rampant. Several accidents have resulted in deaths of rat-hole miners in the Northeastern state. In 2018, 15 men involved in illegal mining were trapped inside a flooded mine. Only two bodies could be recovered in the course of the rescue operation that lasted for more than two months. Another such accident took place in 2021 when five miners were trapped in a flooded mine. Three bodies were found before rescue teams called off the operation after a month. Add to this the environmental pollution caused by this method.