The project took place in February 2026 near Eemshaven and focused on sections of the COBRA interconnector cable linking the Netherlands and Denmark. TenneT commissioned FreeStar to carry out a 4K ultra-high-definition video survey to carry out a depth of cable burial survey. For this project, Seekable introduced its new electro-magnetometer-based survey system to determine cable positioning and burial depth. Operating in water depths of around five meters, FreeStar deployed its ROV inspection capabilities from the *Navicula Star* while simultaneously hosting additional survey technologies from specialist partners. The campaign brought together three different cable detection and inspection methods on a single vessel. Alongside the ROV services of Vriezoo ROV Services, the project incorporated advanced sensing systems from MAPPEM and Seekable. MAPPEM deployed both a mobile passive system and a seabed-based station capable of measuring extremely small electric and magnetic fields generated by HVDC cables.…