Rescue ops continue for 4 workers trapped over 48 hours after an avalanche hit a BRO site near Mana village, Chamoli. The disaster buried 54 workers; 50 were rescued, but four died during treatment. Army, Air Force, ITBP, NDRF, and SDRF are leading efforts to find the missing labourers from Himachal, Uttar Pradesh, and Uttarakhand.