But when the Olympic opening ceremony starts on 27 July, data will flash through them as they transmit the highest definition pictures Olympic coverage has ever seen.
Technology has come a long way since the last Olympics in London in 1948, broadcast in black and white.
The cables will carry ultra-high definition video, which at a resolution of 7680x4320 is an astonishing 16 times the quality of HD television.
The video technology was developed and supplied by Japanese broadcaster NHK, and is known as Super Hi-Vision"
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