Thanh Hoa authorities are seeking assistance from the Ministry of Defence in their search for three people missing in an illegal gold mine in the northern province for a third day.
On June 4 Kha Van Ngon and Kha Van Huyen were searching for gold ore in an underground mine in the mountainous Ba Thuoc District when they were affected by poisonous gases.
Ngon managed to reach the mine’s entrance to shout for help.
Hearing his cries, another miner, Pham Van Dung, went into the mine to look for Huyen, but he is also missing.
A second man, Bui Van Man, also went into the mine for a rescue attempt and is missing too.
On June 7 dozens of rescuers were mobilized to search but they only managed to get seven meters into the cave due to heavy rainfall.
According to local residents, the mine is some 300 meters deep and the three might have asphyxiated due to lack of oxygen.
Vo Minh Khoa, a local official, said rescuers are considering widening a narrow section of the mine or digging another way into it.
Rescuers faced great difficulty because they have to walk eight kilometers to the mine and the area is too remote for mobile phone signals.