Undersea Fiber Optic Cables : How the Internet Travels Across Oceans 

Undersea fiber optic cables are the backbone of the global internet, transmitting the vast majority of the world's digital communications across the ocean floors. These cables are a critical component of modern society, enabling communication between continents, businesses, and individuals.
Currently, it's estimated that there are more than 420 underwater fiber optic cables installed worldwide, with a total length of 1.3 million kilometers. The exact number is difficult to determine because new cables are being laid and the older ones are being retired, but this is roughly the number of cables that are in active use.
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