During 1961-1965, the town north of the Cu Chi tunnels shaft glands completed called "backbone", after which the unions, agencies, local development units branches Director eating with axial lines forming the continuous tunnels between the hamlet, the town and the region. Above ground, the population of Cu Chi also dug a trench transport belt interlaced connections with location scouts, location Scouts at this fight also was divided into several floors, the many crannies. Also, above the tunnels are also a lot of combat gear head, spiked pits, minefields, countering the cellar ... was arranged into complete cluster created the battlefield firmly in a guerrilla war, known as XA.In 1965, about 200 km of tunnels had been dug. On the scale, the system has a total length of all tunnels is over 200 km, with three layers of different depths, the floor on the way to the ground about 3 m, middle ground way about 6 m, 12 m deep bottom floor. At this time, not only is the shelter that has become home to , ambulance, meetings, storage of weapons.
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