<P> The 20,000 tonne Bandra - end span of the bridge deck is supported by stay cables within a very close tolerance of deviations in plan and elevation . </P> <P> The Bandra--Worli Sea Link was the first infrastructure project in Mumbai to use seismic arresters . These will enable it to withstand earthquakes measuring up to 7.0 on the Richter scale . </P> <P> The construction of the bridge's structure presented major engineering challenges . These included the highly variable geotechnical conditions due to the underlying marine geology of the seabed . At times, even for plan area of a single pile had a highly uneven foundation bed . Further complications included the presence of a variable intertidal zone, with parts of the foundation bed exposed in low tide and submerged in high tide . </P> <P> The foundations for the BWSL's cable - stayed bridges consist of 120 reinforced concrete piles of 2,000 millimetres (6.6 ft) diameter . Those for the viaducts consist of 484 piles of 1,500 millimetres (4.9 ft). These 604 piles were driven between 6m and 34m into the substrate in geotechnical conditions that varied from highly weathered volcanic material to massive high strength rocks . </P>

Bandra worli sea link has steel wires equal to the earth's circumference