Originally delivered in 2014 by Norwegian shipyard Simek AS, the 77m vessel spent more than a decade working in the offshore energy sector before undergoing a substantial transformation into a dedicated yacht support platform.
While details surrounding the project remain largely private, the conversion yacht is understood to have taken place at Zwijnenburg Shipyard in the Rotterdam area, where the vessel arrived earlier this year.
A New Role for Former Supply Vessel FS Cygnus
Before entering the yard, FS Cygnus featured the industrial profile typical of offshore support vessels, including a bright red hull and a large open working deck aft. Newly released images reveal a dramatically different appearance, with the vessel now sporting a white hull and superstructure more closely aligned with contemporary yacht support designs.
The yacht spent approximately 11 weeks undergoing work at Zwijnenburg before re-emerging under the name U-81, prominently displayed on both her hull and stern. The new identity has prompted speculation about a connection to the former 80.1-meter Damen-built support vessel U-81, which was sold in 2025 and subsequently renamed Wingman.
Reconfigured for Life in the Superyacht Sector
Although the full scope of the conversion has not been disclosed, visible modifications indicate a substantial redesign rather than a simple cosmetic refit. The original continuous working deck has been reconfigured with an elevated aft structure that creates sheltered storage space below while extending the vessel's profile. A helideck and enclosed hangar have also been added, significantly expanding operational capability and strengthening the yacht support brief.
Images additionally show a dedicated platform designed to protect and house tenders carried on deck. The result is a vessel that retains the robust proportions of her commercial origins while presenting a more motor yacht-oriented appearance.
The redesign is reported to have involved Dutch studio Studio ZEA, the recently established design practice founded by yacht designer Zlatko Imamovic. Azure Yacht Design & Naval Architecture is understood to have acted as the owner's representative throughout the project.
Built on a Proven Offshore Platform
As FS Cygnus, the vessel was designed for demanding offshore operations. Exterior styling and naval architecture were developed by Ulstein Verft, with the platform built entirely in steel. Original specifications included a gross tonnage of approximately 2,420GT and a beam of 16 meters, providing a substantial foundation for conversion into a long-range support vessel capable of carrying tenders, watercraft, equipment, and aviation assets alongside a superyacht.
Industry reports suggest the vessel was acquired by a private owner earlier this year before entering the conversion program, though ownership details have not been disclosed.
Growing Interest in Commercial Vessel Conversions
The emergence of U-81 comes amid growing interest in large-scale yacht conversions, particularly projects based on commercial and offshore yachts that offer substantial volume, long-range capability, and proven seakeeping characteristics.
One of the most notable recent examples is the 87.9-meter L Symphony, a former offshore supply vessel that was photographed for the first time in April 2026 following an extensive conversion in Germany. Originally delivered as the commercial vessel Energy Lindesnes, the project is transforming the industrial platform into a private expedition yacht.
The sector has also been watching the progress of Project Master at ICON Yachts. Based on a commercial offshore vessel, the 70-meter explorer yacht conversion reached major construction milestones during 2025 as work continued on transforming the platform into a long-range expedition yacht designed by Espen Øino.
U-81 represents the latest addition to a growing fleet of commercial vessels finding a second life in the superyacht sector, where owners are increasingly seeking platforms capable of supporting extended cruising, expedition operations, and large tender collections.
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