This is a unique structure located deep in the ground, there are many stories, many nooks and crannies, such as spider webs on the 200km long, where food, accommodation, meetings and struggle of our army and people. With 3 different depths, on the ground floor of about 3m above the ground floor between approximately 6m and 12m deeper bottom floor. So far Ben Duoc Tunnels and Ben Dinh has been recognized as a State Historic national level.
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