Allseas expands fleet with 2 offshore construction vessels

The two Salt-designed vessels will be built in China by Wuchang Shipbuilding for delivery in September and December 2026.

The vessels tick the green box, with a hybrid 1,500kWh battery storage system and propulsion design for ‘future fuel flexibility’, which is methanol ready, Allseas says.

“The new vessels boost Allseas’ construction and support capacity, enabling greater deployment flexibility and freeing up existing OCVs for larger, more complex scopes of work,” says Allseas. “This investment ensures Allseas remains at the forefront of the growing offshore construction and subsea installation sectors.”

Each vessel will be 100 metres long with a 1,100m₂ cargo deck and accommodation for 110 persons. They have a 150t active heave-compensated offshore crane, and hangar housing for two work-class ROVs for the subsea work.

“We recognised a clear need to optimise our vessel deployment to support an increasingly diverse and complex project portfolio,” said Dries van Strijp, Allseas’ vice president Operations. “After carefully exploring all available options, it became clear that securing two next-generation newbuilds – fully optimised with the latest technology – was the best long-term solution to strengthen our capabilities and capture new opportunities in a growing offshore market.”

The vessel orders come after Allseas completed a UXO survey in the North Sea for the PORTHOS project, a subsea carbon capture and storage project in the Dutch North Sea.