Submarine Cables and Atlantic Resilience

Submarine telecommunications cables sustain international relationships across finance, public administration, commerce and research. Their importance cannot be assessed through cable numbers, capacity or reach. This working paper examines the institutional conditions under which Atlantic connectivity can reduce strategic dependence and preserve essential services during disruption. The analysis develops a conceptual framework informed by policy documents, maritime legal provisions and specialist industry guidance. It distinguishes physical redundancy from effective substitutability, emphasising that apparently separate connections may share landing facilities, terrestrial corridors, commercial providers or restoration constraints. It also separates incident consequences from attribution, recognising the importance of accidental damage alongside deliberate threats. Four analytical dimensions organise the proposed framework: knowledge, authority, coordination and recoverability. These dimensions connect awareness of service dependencies with decision rights, information exchange and the mobilisation of repair resources. Recovery is examined as an interdependent sequence involving detection, assessment, permissions, vessels, equipment and operational conditions. The paper further considers how contractual arrangements and unequal institutional resources affect access to alternatives and the distribution of disruption costs. An Atlantic research agenda is proposed around comparable services rather than national infrastructure totals. Documentary analysis, interviews, incident reconstruction and scenario exercises could investigate how technical configurations interact with institutional arrangements. Portugal, Brazil and other Atlantic partners provide potential settings for such comparison, without presuming equivalent needs or capabilities. The paper contributes an institutional perspective to debates on digital infrastructure resilience and identifies practical questions for procurement, continuity planning and international cooperation. Its central proposition is that connectivity becomes strategically resilient when organisations can understand dependencies, exercise responsibility, sustain essential functions and organise restoration. The framework remains unvalidated: the analysis presents research propositions and hypothetical illustrations rather than empirical assessments of named cable systems. Future application should establish appropriate indicators and examine the conditions under which institutional improvements produce demonstrable continuity benefits.