The cu Chi tunnels located about 70 km Northwest of Ho Chi Minh city in the administrative district of Cu Chi. The area is widely known nationwide as the base where the Vietnamese were preparing their operations for offensive the Tet offensive in 1968. The tunnels consist of underground passages with a length of over 250 km aisle Width from 0.5 to 1 m is sufficient to push the man of small physique. Part of the tunnels was modified and expanded to accommodate them for the reception.