Sourcing of data and evidence for policy design and implementation of Trans European Digital Networks (TEN-D) complementing the Cable Projects of European Interest (CPEI) exercise. This study should analyse potential gaps in capacity, resilience and security of terrestrial links, taking into account the expected developments in the field of data centres and other AI facilities as proposed in the Cloud and AI Development Act (CADA). The following identification of infrastructure investment gaps and assessment of potential market failures should lead to recommending the most appropriate interventions, including magnitude and instruments requiring EU funding, under the European Competitiveness Fund (ECF).