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Transatlantic Fiber-Optic Expialidocious
Brief
TAT‑8 — the first transatlantic fiber‑optic submarine cable — is the episode’s subject, and the hosts trace how it catalyzed the modern internet and why it’s now being pulled up and recycled. Christopher Johnson recounts how AT&T and Bell Labs, in partnership with UK and French telecoms, built and stress‑tested the undersea system (using the Holmdel Ocean Simulation Facility), debugged signal breaks thought to be seafloor abrasions, and even ran aquarium “shark” trials that led to heavier armoring. Launched in December 1988 with Isaac Asimov on the ceremonial call, TAT‑8 carried 40,000 simultaneous phone calls—ten times the capacity of its copper predecessor—was full within 18 months, and stopped operating in 2002.
The episode situates TAT‑8 in a larger arc: Jane Rafino emphasizes that roughly 1.5 million km of submarine fiber now carry about 95% of intercontinental traffic, eclipsing satellites (which still serve remote or redundant links). Today big tech companies control a large share of subsea bandwidth, and demand from AI projects is driving new mega‑cable builds. Because seabed routes are now scarce, operators are recovering legacy systems like TAT‑8: crews of about 14 use grapnels and winches to haul candle‑thin deep‑sea cable into tanks, coil it in grueling 30‑minute shifts, and ship sections ashore to strip copper, steel and plastic for recycling while the glass fibers remain largely unreusable.
Why it matters
Jane Rafino (researcher): roughly 1.5 million kilometers of submarine fiber-optic cable exist and about 95% of intercontinental internet traffic travels over submarine telecommunications cables.
Key details
- Christopher Johnson (reporter): TAT-8 (Transatlantic Telephone fiber optic submarine cable 8) was the first transatlantic fiber‑optic cable, switched on in December 1988, carried 40,000 simultaneous phone calls (10× its copper predecessor), filled to capacity within 18 months, and ceased operation in 2002.
- Christopher Johnson & reporting from Bell Labs tests: AT&T/Bell Labs led a U.S.–UK–France consortium, used an Ocean Simulation Facility at Holmdel for stress tests, encountered signal breaks (likely seafloor abrasions), and ran aquarium ‘shark’ experiments that led engineers to add extra armoring before laying the cable in 1986.
- Christopher Johnson: ownership of subsea bandwidth is now dominated by big tech—Google, Meta, Microsoft and Amazon together own or lease about half the world’s subsea bandwidth—and an AI-driven surge is triggering a new subsea‑cable boom, including a planned cable to link five continents.
- Christopher Johnson (recovery crew interviews): retired TAT‑8 is being recovered by ~14‑person ships using a flat grapnel ('flatfish') and long ropes, coilers walk backwards to coil cable in 30‑minute shifts ('14 cigarettes long'), crews can haul ~1,000 km sections, and materials (copper, steel, plastics) are stripped and recycled while the glass fibers are largely unreusable.