N-Sea, a leading subsea and offshore cable solutions provider, has commissioned its trusted partner Neptune Marine to build a next-generation, multi-purpose shallow draft vessel specifically designed for cable installation and maintenance operations. Currently under construction in Poland, the vessel will transfer to the Netherlands in Q4 2025 for final outfitting and commissioning in Q2 2026, reinforcing N-Sea’s capabilities in the rapidly growing offshore energy sector.
The new built DP2 vessel, ‘Altera’ will be dual fuel (methanol) prepared, equipped with a 25t offshore knuckle boom crane, mooring system and can accommodate up to 99 people.
The deck spread has been designed and procured by N-Sea, considering valuable lessons learned by the N-Sea team over the last 15 years, in cable repair and installation on Offshore Wind and Interconnector projects. The 4,500t carousel, 15t tensioner, quadrant handling system and shutes have been designed to handle cables with minimum bending radius till 5mtr. Installation of the deck spread will start in Q1 2026 by the N-Sea mobilisation team in The Netherlands, managed from the new offshore supply base and logistic centre in IJmuiden.
Due to the combination of its mooring system, DP2 capabilities and beaching capacities, the shallow draft cable installation vessel will be able to operate year round in both very shallow and deep water conditions, on interconnector, export and inter-array cable projects.
About N-Sea
N-Sea is an integrated total subsea solutions provider in Survey, UXO ID & Disposal, IRM & Construction, and Subsea Cable Repair & Installation. They deliver total solutions for subsea infrastructures and assets that meet the needs of our clients and the international offshore Energy industries, considering a safe (working) environment. They create substantial value through managing and reducing complex interfaces, solid project management & -support and full client focus and awareness. N-Sea Group is a privately owned company headquartered in The Netherlands with decades of experience, over 500 people employed, operating in EMEA region with a revenue of € 200 million in 2024.
