How the Internet Crosses the Ocean

When you message another continent, you picture a satellite. Almost none of it goes to space. About 99% of intercontinental data travels through roughly 500 submarine cables — glass threads thinner than a garden hose, lying in the dark on the ocean floor. This is how the world's messages swim: the 1858 cable that took 16 hours to send 98 words, repeaters boosting light every 80 kilometres nearly 8 km down, the few dozen ships that lay and repair them, the volcano that cut a whole country offline — and yes, the sharks.

⏱ Chapters:
0:00 The drop to the ocean floor
0:15 The invisible network
0:38 The first cable: 1858
1:07 Anatomy of a cable
1:36 Light in a glass thread
2:09 The ships that lay them
2:36 Eight kilometres down
3:05 When cables break
3:41 Yes, sharks
4:03 Hundreds of terabits
4:29 It lands on a beach
4:57 Why not satellites?
5:25 A thread of light

Sources & further reading: TeleGeography Submarine Cable Map & FAQ (cable counts, fault causes); public reporting on the 2022 Tonga cable cut. Stock footage: Pexels (Pexels Licence). Diagrams drawn for this video. Narration: AI-generated voice (Helio) with human-written script — contains AI-generated audio.

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