- Nexans successfully completes electrical testing and visual inspection of a 525kV MI HVDC cable with joint installed at a world-record depth of 3,000 meters during deep-water sea trial.
- High-voltage testing performed 30% above typical industry standards, confirming robustness of the cable system.
- Achievement builds on Nexans’ 2,150-meter installation world record set on the Tyrrhenian Link project in December 2025.
Nexans has set a new world record by successfully installing and testing a 525kV mass-impregnated (MI) high-voltage direct current (HVDC) subsea cable at a depth of 3,000 meters during a deep-water sea trial.
During the offshore campaign, Nexans installed and tested a section of MI HVDC cable at 3,000 meters water depth. Following recovery of the cable with joint, comprehensive electrical testing and visual inspection confirmed the integrity of the cable system and its ability to perform under extreme deep-water conditions.
The post-trial high-voltage testing was conducted 30% above typical industry standards, further validating the robustness and reliability of the cable system. Visual inspection of the cable showed no remarks, confirming the system’s integrity after installation and testing at this depth.
The sea trial was conducted as part of Nexans’ work on the Great Sea Interconnector, a major subsea HVDC project connecting the electricity systems of Greece and Cyprus for the project developer IPTO.
This milestone further strengthens Nexans’ expertise in deep-water MI HVDC technology, building on the 2,150-meter world-record installation depth achieved in December 2025 during the Tyrrhenian Link project in Italy.
Reaching 3,000 meters sets a new benchmark for deep-water subsea power transmission. Combined with the 2,150-meter world-record installation achieved on the Tyrrhenian Link just months ago, this milestone demonstrates Nexans’ unmatched experience in mass-impregnated HVDC technology. It reflects decades of engineering expertise and the exceptional capabilities of our teams, who continue to push the boundaries of what is technically possible in subsea power transmission.
Executive Vice President, PWR-Transmission, Nexans