Nexans said it achieved a “world-record” depth of 3,000 meters for massimpregnated (MI) high-voltage direct current (HVDC) subsea cable during a deep-water sea trial, as part of works on the Great Sea Interconnector, a project connecting the electricity systems of Greece and Cyprus.
In an announcement, Nexans said it has set “a new world record by successfully installing and testing a 525kV massimpregnated (MI) high-voltage direct current (HVDC) subsea cable at a depth of 3,000 meters during a deep-water sea trial.” 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,” it adds.
During the offshore campaign, it said, 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,” it said.
It is noted that the post-trial high-voltage testing was conducted 30% above typical industry standards, “further validating the robustness and reliability of the cable system.”
“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,” the company said.
“Reaching 3,000 meters sets a new benchmark for deep-water subsea power transmission,” Pascal Radue, Executive Vice President, PWR-Transmission at Nexans said, according to the announcement. “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,” he said.
(Source: CNA)
