The Undersea Cable Network
summary
About 1,700 operational undersea cables carry most global internet traffic and modern fiber builds like the 6,600 km Dant cable hold ~250 Tb using 12 fibers and cost about $200M with ~20‑year lifetimes; electrical repeaters every ~100 km (2–4 m long) run on copper conductors inside the cable, and repair uses specialized ships plus ROVs; expect 100–200 cable faults per year, common causes are anchor drags and earthquakes, and some repairs (e.g., Tonga) take months to over a year.
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chapters (23)
- 0:00Undersea cable networks intro
- 2:18History of undersea cables
- 6:13WWII pipeline innovations
- 8:41Deep-water oil pipelines
- 10:03Telephone and fiber tech
- 12:35Why satellites can't replace cables
- 13:38How fiber cables are made
- 17:07Designing undersea fiber cables
- 21:19Google’s Dunant cable case
- 24:03Cable laying process
- 26:11Cable landing stations
- 27:14Causes of cable damage
- 28:58Cable repair ships and robots
- 30:42Mediterranean high-risk zones
- 33:50Baltic Sea sabotage tensions
- 37:24NATO’s Baltic monitoring
- 41:59Small nations’ cable vulnerability
- 43:43Tonga’s cable failure
- 45:50Cold War sonar arrays
- 47:34Undersea drones and protection
- 48:38Next-gen cables and capacity
- 49:41Tech giants in cable networks
- 50:24Cable network security risks
related talks
41mThe Undersea Infrastructure
57mThe Undersea Cable Network
43m20,000 Clouds Under the Seas
09m20,000 Leagues Inside the Optical Fiber
20mFiber Networks Innovations for AI at Scale
19mFiber Networks Innovations for AI at Scale
23mQ&A Session 2 – Andrey Golovanov
24mWiring the Planet: Scaling Meta's Global Optical Network