Forest rangers in the central resort town of Da Lat on Friday filled in the vent-holes of hundreds of underground tunnels dug by illegal tin miners.
According to the rangers, the holes of the tunnels under the famous Valley of Love had diameters of between 0.2 and 0.8 meters and were as deep as 15 meters.
Tran Thanh Binh, chief of the town's Forest Rangers, said they did not use mines to destroy the tunnels as planned earlier. He explained that if the mines were planted at the entrances, they would be effective only within a radius of 50 meters, which is not enough to stop the miners from continuing their illegal actions.
It is likely that they will find other ways to enter the tunnels, Binh said.
Last month end local authorities found a new entrance to the tunnels which were first made in 1995 and have since then kept reappearing and expanding despite authorities' efforts to collapse them.
The last time the network was cleared was more than four years ago.
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