Rescue teams in Nepal and Tibet are racing against time to save over 900 construction workers believed trapped in tunnels following a devastating avalanche. Authorities report the workers were likely inside hydroelectric project tunnels when the avalanche struck. Controlled explosions are now being used to clear the blocked passages and access those potentially stranded. The operation is hampered by treacherous conditions and the instability of the surrounding terrain. Details on the workers' condition and the extent of the tunnel collapses remain scarce. International assistance may be required as the search intensifies, with concerns growing for the safety of the hundreds still unaccounted for.