China has issued a stark warning of a “high risk” that a newly formed barrier lake near the Nepal-Tibet border could burst, potentially unleashing a second catastrophic flood downstream. The alert comes just days after a deadly flash flood tore through the same region on Wednesday, an event scientists say was triggered when a mountain glacier collapsed into a river system, sending a violent surge of water and debris through remote Himalayan valleys.
The landslide that followed the glacier collapse blocked the river’s flow, creating a growing lake behind a natural dam of rock and ice. Authorities fear that continued pressure on this unstable barrier could cause it to fail, releasing another destructive wave into communities already devastated by the earlier disaster.
Rescue teams working in the area say the situation remains volatile, with the newly formed lake expanding rapidly and the terrain too dangerous for heavy machinery. The fear is that even a minor breach could send water cascading into settlements downstream, complicating ongoing rescue and recovery efforts.
Scientists monitoring the site warn that such barrier lakes are notoriously unpredictable. Their formation often signals further instability in surrounding slopes, especially in regions where glaciers are thinning and mountain surfaces are weakening. With the memory of Wednesday’s deadly flood still fresh, authorities are racing to assess the lake’s behaviour and prepare downstream communities for any sudden change.
The Himalayan border region remains on high alert as experts continue to track water levels and structural shifts in the natural dam.
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