N-Sea Group continues its fleet expansion with a new, next generation, multi purpose shallow draft vessel

N-Sea’s trusted partner Neptune Marine is currently building a new, next generation, multi purpose shallow draft vessel for N-Sea’s cable installation and activities. The vessel is under construction in Poland and will transfer to The Netherlands in Q4 2025 for fitting and commissioning in Q2 2026.

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 vessel will be able to operate year round in both very shallow and deep water conditions, on interconnector, export and inter-array cable projects.

As your specialist in Subsea Cable installation, repairs, and replacements, we offer dedicated in-house teams, two dedicated mobilised vessels, customised installation and repair preparedness engineering, and an Operations Support Base in Port of IJmuiden, NL. We look forward to meeting you to discuss your cable installation needs, along with our tailored ad-hoc and framework cable maintenance and repair solutions.

About N-Sea
N-Sea is an end-to-end subsea services provider. With a fleet of 14 multipurpose vessels and a range of in-house systems and equipment, N-Sea delivers smart, fit-for-purpose solutions for subsea infrastructure projects in every stage of the offshore asset life cycle for customers in the international offshore energy industry. Our bespoke solutions focus on specific subsea capabilities, such as survey, UXO ID & clearance, cable repair & installation, or IRM, construction & decommissioning.

With the support of an experienced, multidiscipline offshore operations team, we integrate these bespoke capabilities into a single project, delivering a smart, fit-for-purpose, safe and sustainable solution that improves the efficiency of subsea projects and reduces projects risks for our customers.

N-Sea Group is a privately owned company headquartered in the Netherlands, with more than 500 people working offshore and onshore, on board vessels and in facilities across Europe and the Middle East, and a revenue of more than €200M in 2025.

N-Sea. Smart Subsea Solutions.

N-Sea

Media contact
Danielle Biermans
Marketing Communication Manager
T +31 (0)111 456 000
E d.biermans@n-sea.com