The risks were high. Drilling blindly could miss the chamber or cause further collapse. The coordinates had to be perfect.
Gill’s plan was to drill a "pilot hole" from the surface directly down to the gallery where the miners were trapped. If they could locate the exact spot, they could lower a rescue capsule—a steel capsule large enough to hold one man at a time—through the borehole. raniganj coal mine rescue full
The Raniganj coal mine rescue operation offers several key takeaways: The risks were high