Double-check if there's any notable event or reference from 2021 that might be linked, but I don't recall any. So it's safer to guide the user towards common practices and resources, emphasizing consulting local experts for personalized advice.

If you found an "index of" link for Kaala Patthar in 2021, it was likely:

: In January 2022, Vicky Varun took over as director and cast Dhanya Ramkumar (granddaughter of Dr. Rajkumar) as the female lead.

as Mangal Singh, an escaped convict who finds his conscience in the heat of the disaster. Why the "2021" Keyword?

Kaala Patthar is a 1979 Indian Hindi-language film directed by Vinayak Damodar Shanmugaratnam, and produced by Vinod Khanna. The film stars Amitabh Bachchan, Vinod Khanna, and Rekha. The movie revolves around the lives of coal miners in a small village in India.