Follow the route beyond the building
A data center can have resilient equipment and still depend on a vulnerable connection beyond its boundary. The route from a rack to another continent may cross a building entrance, a metro fibre network, a landing station and a submarine system. Each handover adds a question about where the service actually runs.
In July 2026, the International Advisory Body on Submarine Cable Resilience approved its final report. The ITU highlighted physical exposure, repair delays, geographical concentration and dependence on small numbers of systems. These are global infrastructure questions, not problems confined to one coast or market.
Two contracts can still share one route
Buying services from two providers does not, by itself, demonstrate physical separation. Ask which parts of the path are distinct and which remain shared. A different commercial name may not answer whether both circuits use the same entrance, duct, landing area or onward corridor.
The advisory body’s work treats geographic diversity as one part of resilience alongside deployment, repair and risk reduction. Apply that distinction to the service being bought: the useful comparison is the failure each path can survive. A route diagram should state its scope and date, including any sections for which the provider has not supplied physical detail.
Landing is a milestone, not the whole service
A cable announcement can describe a plan, construction, a landing or readiness for service. Those stages should not be collapsed into one date. In February 2021, Google said Dunant, its transatlantic system between the United States and France, had been deployed and tested and was ready for service. The announcement explicitly linked the operational milestone to completed work.
Even that does not define every customer’s end-to-end connection. A service still needs capacity, interconnection and a terrestrial route to the relevant facility. When reading a new-project announcement, ask which of those elements it establishes and which it leaves for a later agreement. This distinction protects the reader from mistaking a map of intended routes for a catalogue of orderable services.
Resilience includes the repair
Protection and recovery are different tasks. The International Cable Protection Committee publishes industry recommendations covering activities around cables and post-installation protection. Its guidance is not a binding global standard. The European Commission’s Joint Research Centre also describes risks from fishing, anchoring and natural events, together with physical protection and monitoring measures.
The repair plan matters after those measures are exhausted. Ask about maintenance arrangements, access to repair resources and the conditions that can slow recovery. A service may need to continue over another path while a physical repair is organised. Do not turn a headline fault count into an estimate of a particular facility’s downtime without evidence linking the two.
International Cable Protection CommitteeEuropean Commission Joint Research Centre
Test the service that survives
A practical resilience review starts with a named interruption: one building entrance, one metro segment, one landing location or one long-haul system. Then trace the remaining service. Can it carry the required traffic, at the required latency, to the destinations that matter? Distinguish what a diagram shows from what has been exercised.
This is a framework for asking better questions, not a claim about any named provider. The goal is to connect a commercial promise to a physical route and an operating response. A second line on a network diagram becomes meaningful when the reader can see what it preserves.
International Telecommunication UnionEuropean Commission Joint Research Centre
Sources
- International Advisory Body approves landmark report to strengthen submarine cable resilienceInternational Telecommunication Union · 10 July 2026
- International Advisory Body on Submarine Cable Resilience: Report of the Working GroupsInternational Telecommunication Union · 2026
- The Dunant subsea cable is ready for serviceGoogle Cloud · 3 February 2021
- ICPC RecommendationsInternational Cable Protection Committee · Accessed 29 October 2026
- Subsea cables: how vulnerable are they and can we protect them?European Commission Joint Research Centre · Accessed 29 October 2026
Company sources describe their own work and terminology. Our editorial approach
