Underwater cables are crucial to offshore wind farms as they transport power from the wind turbines back to land, accounting for 10% of project costs. Faults in cables cause 70% of insurance claims, and repairing cables can be difficult work affected by weather. Experts say successful cable installation relies on thorough planning, engineering, and coordination between installers and developers from an early stage. A future European supergrid may help countries share renewable energy resources through interconnected offshore cabling networks.