Thin underwater cables hold the internet. See a map of them all.

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Today’s global digital network still rests on technology dating back 157 years: submarine telegraph cables.
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The first submarine cables used exotic tree sap as waterproofing before petroleum jelly became standard.
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The internet’s ocean infrastructure is vulnerable to earthquakes, ship activity, and even confused sharks biting cables.
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Satellites, balloons, and cell towers reach above sea level, yet Facebook and Google still choose undersea cables for speed.
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Installation ships plow grooves into the ocean floor, lay cables inside, and let currents bury them with sand.
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Some undersea cables descend as deep as Mount Everest is high, far below ordinary sea life.
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About 300 undersea fiber-optic cables carry 99% of international data traffic, making oceans the internet’s hidden backbone.
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Undersea cables protect their fragile fibers from seawater with only a few layers, including petroleum jelly.
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Telegraph networks grew from experiments connecting two ends of a garden to neighborhoods, train signaling, and multiple cities.

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