Time-critical blast: Nepal rescuers race to reach trapped hydropower workers

Rescuers in Nepal are blasting a hillside and pumping air into mud-filled tunnels to reach more than 600 workers trapped at hydropower plants along the Trishuli River after catastrophic floods; with the death toll near 939 and about 3,925 missing, teams led by Nepalese and Chinese forces are racing to access the tunnels before conditions deteriorate, while some workers have already been rescued and families await news.