Rescuers on Saturday were busy widening a hole in a tunnel to find 25 to 35 trapped people in the disaster-hit Tapovan project area of Chamoli district in Uttarakhand.

Top government and police officials said there was no big breakthrough yet in the rescue work which entered the seventh day. "We have made a hole but we can't say it is a big breakthrough unless we find something concrete," said a top police official.