NATIONAL GEOGRAPHIC – Tuesday 21 October, 10.30pm

The longest suspension bridge in the world, stretching unsupported for nearly two miles over the Akashi Strait, is the Akashi Kaikyo Bridge in Japan. Seven ingenious technological breakthroughs led to the development of this super-structure, from robots that paint it to the wires supporting its deck – long enough to stretch over seven times around the world – to its earthquake-proof towers. The bridge is made from over a quarter of a million tons of steel, its 28,000 ton cables are anchored into the riverbanks and engineers built a scale model of the bridge 40 metres long to test how its design would stand up to typhoon winds of up to 180 miles per hour. Find out what the innovations were that changed bridge design forever and enabled them to grow in size and scale… from BIG to BIGGER into the Akashi Kaikyo, the world’s BIGGEST.

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