Solibar Rahman stopped working in Meghalaya's illegal coal mines in 2012. The native of this village in western Assam's Chirang district is, however, confident of his skills and is now bracing for one last attempt to rappel down the 380-foot coal mine at Ksan in Meghalaya's East Jaintia Hills district to search for his son, who had not returned from the mine since December 13.