A dozen workers trapped inside a collapsed tunnel at the Da Dang-Da Chomo hydropower plant have been rescued, officials in Vietnam's Lam Dong province said.
The workers were trapped earlier this week when a section of the tunnel caved in during construction about 500 meters from its entrance.
Rescuers were able to locate the workers about 12 hours after the collapse, and drilled a hole to deliver food and air while a recovery tunnel was dug.
It is not known what caused the tunnel collapse, but locals speculate the area’s recent heavy rainfall may have contributed. Others said the area might have geologically weak features that are a contributing factor.
The 23 MW hydroelectric project is being constructed on the Da Dang River.
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