Microsoft, Facebook, and Telxius complete 160Tbps Marea cable, the highest-capacity subsea cable across the Atlantic
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Context & Ripple Effects
Marea closes the loop on the 2016 partnership announcement that paired Microsoft's Virginia cloud region with a Spanish landing point via Telxius, the Telefónica infrastructure unit. The completion lands just months after Facebook and Nokia showed existing cables could be pushed from 13Tbps to 32Tbps with new modulation techniques (that speed test), signaling how quickly subsea economics were moving.
The significance is who built it: not a telecom consortium but two content companies plus one carrier operator. That model — hyperscalers funding their own ocean-floor capacity — is the throughline running from this cable to the Jupiter consortium with SoftBank and Amazon announced weeks later, and it is what the 2022 WSJ analysis of Alphabet, Amazon, Meta, and Microsoft cable-building later quantified.
First-order effects
- Microsoft gains dedicated, highest-capacity transatlantic paths between its Virginia data centers and European markets, reducing its dependence on third-party carriers' congested routes for Azure traffic.
- Telxius gets an operating asset it can light and sell capacity on beyond its two anchor tenants, converting hyperscaler capex into carrier revenue.
Second-order effects
- Rival clouds respond in kind rather than renting: Amazon joins the Jupiter cable within weeks, and AWS eventually commits to its own 320Tbps Fastnet project across the same Atlantic corridor, confirming Marea as the template for competitor infrastructure builds.
- Hyperscaler-funded supply pushes down the marginal cost of transatlantic transmission, pressuring traditional submarine-cable consortia and wholesale bandwidth sellers whose pricing assumed carrier-controlled capacity.
Third-order effects
- If the pattern holds, ownership of intercontinental bandwidth migrates from telecom operators to the handful of companies whose workloads justify it — concentrating both the infrastructure and the routing decisions over global data flows in a few firms.
- That concentration raises the regulatory question of whether privately owned subsea arteries need neutral-access guarantees, since the entities building them are also the largest consumers of their capacity.
The trend: Subsea infrastructure is shifting from telecom-carrier consortia to hyperscaler-owned builds, with each completed cable resetting the capacity bar competitors must match.