Robin Chataut in The Conversation:
Have you ever wondered how an email sent from New York arrives in Sydney in mere seconds, or how you can video chat with someone on the other side of the globe with barely a hint of delay? Behind these everyday miracles lies an unseen, sprawling web of undersea cables, quietly powering the instant global communications that people have come to rely on.
Undersea cables, also known as submarine communications cables, are fiber-optic cables laid on the ocean floor and used to transmit data between continents. These cables are the backbone of the global internet, carrying the bulk of international communications, including email, webpages and video calls. More than 95% of all the data that moves around the world goes through these undersea cables.
These cables are capable of transmitting multiple terabits of data per second, offering the fastest and most reliable method of data transfer available today.
More here.