<P> 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 and completed about 1980 , 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 DDM 16,155,000 or about US $3,638,000 . The concrete provisions added to this version of the Wall were done to prevent escapees from driving their cars through the barricades . 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 . </P>
<P> 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 and completed about 1980 , 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 DDM 16,155,000 or about US $3,638,000 . The concrete provisions added to this version of the Wall were done to prevent escapees from driving their cars through the barricades . 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 . </P>
when was the construction of the berlin wall finished
when was the construction of the berlin wall finished
about 1980
about 1980