Facebook building subsea cable that will encompass the world

Original Article ↗ Hacker News Discussion ↗

Meta is reportedly planning a massive subsea fiber-optic cable system linking the U.S. East Coast to South Africa, India, Australia, and back to the U.S. West Coast, raising questions about private control of critical global internet infrastructure. Commenters explore who owns and maintains these undersea cables, how capacity is financed and rented (including by big tech and telecoms), and when such assets effectively become matters of national security. There is also debate over how much of the project is confirmed versus speculative, and whether the build-out is really driven by AI needs, cost savings, or strategic control over data flows.

Who Builds and Owns Subsea Cables

  • Historically built by telephone/telecom consortia; now also by “hyperscalers” (Meta, Google, Microsoft, Amazon) and Tier 1 ISPs.
  • Other large private players (e.g., Tata) reportedly own substantial cable assets.
  • Some finance firms use microwave radio for ultra‑low‑latency trading, but bulk financial traffic still rides subsea fiber.

Regulation and Routing

  • Ownership in international waters is private; countries don’t “own” the cable, but regulate via international conventions (e.g., UNCLOS, 1884 cable convention).
  • In international waters, no permit is needed; permits and landing agreements are required in territorial waters and at endpoints.
  • ITU may play a role; details are unclear.
  • Routes are planned with detailed surveys; cables are often buried in shallow water and laid to avoid existing infrastructure when possible.

Maintenance and Technical Details

  • Maritime operations and repairs are contracted to specialist firms and “agreement ships.”
  • Decommissioned cables are typically left on the seabed unless repair/disposal is needed.
  • Cables can migrate over time; one example reportedly moved ~15 km from its trench.
  • Optical repeaters every ~60–100 km amplify light; they are powered by high‑voltage DC carried in the cable. There is some disagreement over whether the ocean is used as a return path.

Capacity, Upgrades, and Commercial Models

  • Initial claim: modern fiber cables have fixed bandwidth once laid.
  • Counterpoint (supported by several examples): capacity can be dramatically increased by upgrading terminal/DWDM equipment without touching the wet plant; one system is said to have gone from 20 Gbit/s to 4.6 Tbit/s.
  • Channels are multiplexed by wavelength; spectrum slices or entire fiber pairs can be leased (“spectrum sale,” “lease a wave,” “dark fiber”).
  • Service tiers range from best‑effort retail internet to guaranteed enterprise bandwidth to dedicated wavelengths and full‑cable leases.

Motives, AI, and Hyperscaler Strategy

  • Large tech firms build cables for more capacity, cost savings versus leasing, and operational control.
  • Some commenters argue “AI” is a marketing label; model training needs huge data movement but isn’t extremely latency‑sensitive.
  • Others note that positioning their own AI layer may be defensive, to avoid being disintermediated by OS/browser‑level AI.

Security, Governance, and Public Interest

  • Cables have been treated as national‑security‑relevant for decades, but they remain private assets.
  • They are effectively impossible to fully protect given global length and seabed exposure.
  • Tension noted: companies treat cables as private when selling capacity, but may invoke national security if attacked to seek government protection or subsidies.
  • Some worry about critical infrastructure being controlled by companies with poor trust reputations; others liken this to private offshore rigs or ships.

Status of the Rumored Meta “World Cable”

  • Core claim: Meta is building a W‑shaped system linking the US East Coast → South Africa → India → Australia → US West.
  • The blog author in the thread states this overall route and fiber‑pair count come from involved sources.
  • Branching units to additional countries are explicitly labeled as speculative “wish list” additions.
  • Other commenters describe the article as “rumors and speculation,” so the level of confirmation remains partially unclear.