The noggies made loads of offshore support ships. For which there is now a limited market. That's why they're screwed.But what about construction of vessels for construction and support of offshore wind turbines and other marine renewables? Marine Renewables use a lot of technology originally developed for oil/gas and defence applications, such as underwater equipment.
Did the Norwegians only make tankers? Bulk carriers, container vessels, and ferries will always be in demand.