China is constructing one of the world’s largest hydroelectric dams on the Yarlung Tsangpo River in Tibet, sparking environmental concerns in Bangladesh and India, as the river flows downstream into both countries. A group of Chinese geologists recently warned that the project site lies directly above an active fault line, posing potential structural risks to the dam.

According to a study supervised by the state-owned China Geological Survey, the Paizhen fault runs through the reservoir area of the project, which began construction last year. Researchers from Chengdu University of Technology and other institutions found that the fault has been active since the Pleistocene era and continues to threaten the stability of dams, bridges, and tunnels in the region. The study also noted that the dam’s foundation and surrounding slopes could weaken, increasing the risk of landslides or collapses during earthquakes or prolonged submersion.

The researchers recommended reinforcing mountain slopes, building retaining walls, and implementing additional safety measures during construction to mitigate seismic and landslide risks.