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99% Invisible
99% Invisible

Transatlantic Fiber-Optic Expialidocious

June 30, 2026 • 31m

Summary

⏱️ 8 min read

Overview

99% Invisible explores the fascinating history of TAT-8, the first transatlantic fiber optic submarine cable that revolutionized global telecommunications in 1988. Reporters Roman Mars and Christopher Johnson trace the cable's journey from its ambitious beginnings through AT&T and Bell Labs, its triumph over satellite technology, and its current recovery from the ocean floor nearly 40 years later. The episode reveals the physical infrastructure behind our seemingly wireless internet and the remarkable human labor required to install, maintain, and now recover these undersea cables.

The Physical Reality of the Internet

The episode opens by challenging the common misconception that the internet is wireless, floating in "the cloud." In reality, 95% of intercontinental internet traffic travels through 1.5 million kilometers of fiber optic cables stretched across ocean floors. These cables, finer than strands of hair, carry information as pulses of light through glass fibers, forming the backbone of global communication that enables everything from Zoom calls to TikToks.

  • Fiber optics translates information into pulses of light that zip down glass fibers finer than hair
  • 1.5 million kilometers of fiber optic cables are stretched across ocean floors worldwide
  • About 95% of intercontinental internet traffic goes via submarine telecommunications cables
  • No matter how wireless your device seems, there is always a wire somewhere
" No matter how wireless your device is and no matter how wireless you think your connection is, there is always a wire somewhere. "

From Victorian Party Trick to Telecommunications Revolution

Fiber optic technology began as a Victorian-era novelty used for decorative purposes and party tricks before finding applications in medicine. It wasn't until the 1970s that the telecommunications potential became clear. As copper-based phone cables struggled with capacity and quality issues, especially for long-distance calls, fiber optics emerged as a revolutionary alternative that could carry far more calls with less static.

  • Fiber optics started as Victorian party tricks and decorative garden lighting before medical uses
  • In the 1960s, copper-based submarine phone cables had severe limitations in call capacity and quality
  • Fiber optic lines could carry way more calls more quickly with significantly less static
  • AT&T broadcast the 1980 Winter Olympics from Lake Placid using the first live fiber optics TV transmission
" I mean, when I was very little, I do remember, especially long distance calls. They sounded long distance, like you felt the physicality and the limits of the physicality of the wires. "

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