Remember those 550,000 miles of undersea cables that power the internet? Learn more about this 150+ year old, cutting-edge fiber optic technology, from what the cable layers are made of, to how they’re installed, to how it all got started, and where it might be going in the future. Vox investigates The Cloud in the ocean: Thin underwater cables hold the internet.

And in case you missed it: TeleGeography’s SubmarineCableMap.com.

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