When that happened, two dozen “rat-hole” miners were deployed to manually drill and clear the passage to the trapped workers. Trained in narrow tunnel navigation, they used handheld tools for excavation to clear the last few metres of debris to get to the workers, who came from some of India’s poorest states.

Source link: https://www.bbc.co.uk/news/world-asia-india-67551478?at_medium=RSS&at_campaign=KARANGA