Electricity
We’ll give you a tip: it all has to do with the electricity that runs through these cables. Did you know that it has only been possible to transport electricity over such long distances since 1882? It was then that engineers Oskar von Miller and Marcel Deprez managed to carry electricity over a longer distance. Very clever indeed: they used high-altitude cables for this, which were actually used for sending telegram messages. The duo then managed to transport 2.5 kilowatts over 60 kilometers. Today, of course, that distance means nothing anymore: our technology is now so advanced that we lay cables across national borders and on the bottom of the ocean.