Its direct result is the unique wonders: 250 km long run ngoắt ngoéo in the ground, are made up of primitive tool is blade and the ki exposed soil. Australian tunnel deep under ground from 3-8 m, height just enough for a person to go to lom khom. The first basement in the very edge of the forest with the underground wells supplying drinking water and living area tunnels. 15 m deep wells, clear waters. The 3 storey tunnels system, from the "backbone" of the long arm of sheds, the short branch to eat circulation, have offshoots emerge to take advantage of the Saigon River. A ground floor 3 m, shell-proof and the weight of tanks, armored vehicles. The second floor is the ground 5 m, could small bombs. Also the last floor is the ground 8-10 m extremely safe. Northern praying mantis up and down between the decks are arranged by the secret cellar hatches. Above the camouflaged discreetly
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