Bosphorus Bridge is one of the first suspension bridges in the world. At the time of its construction, mostly cross-suspension cables were used in this type of bridge throughout the world. However, with time, it has been found that vertical suspension cables are much more efficient in carrying bridges. 
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Therefore, in the 40th Year of Maintenance of the Bosphorus Bridge, cables were replaced vertically. Because vertical cables are not taking a horizontal burden on the bridge, seismic viscous dampers were installed where the deck and tower legs approach each other. Nunteknik lifted these -2,5 ton- dampers to 60 mt height by platforms and installed dampers while the bridge was working.