when was the construction of the berlin wall finished
Berlin Wall The "fourth-generation Wall", known officially as "Stützwandelement UL 12.11" (retaining wall element UL 12.11), was the final and most sophisticated version of the Wall. Begun in 1975[73] and completed about 1980,[74] it was constructed from 45,000 separate sections of reinforced concrete, each 3.6 metres (12 ft) high and 1.2 metres (3.9 ft) wide, and cost DDM16,155,000 or about US$3,638,000.[75] The concrete provisions added to this version of the Wall were done to prevent escapees from driving their cars through the barricades.[76] At strategic points, the Wall was constructed to a somewhat weaker standard, so that East German and Soviet armored vehicles could easily break through in the event of war.[76]