The giant offshore jack-up platform GMS Endeavour, with four lattice legs measuring more than 94 metres each, has arrived in Dún Laoghaire Harbour ahead of a wind turbine repair contract in Liverpool Bay.
The red-hulled vessel berthed at Carlisle Pier on Tuesday evening (10 November), towering over the harbour's pontoons, yachts and waterfront buildings. AIS-derived port-call records put its arrival at approximately 20:12 UTC.
A harbour source has told Afloat that the platform is mobilising for a wind turbine repair contract in Liverpool Bay and is expected to remain at Dún Laoghaire for seven to ten days. Further details of the work have not yet been confirmed.
Four Legs Almost 100 Metres Long
Operated by Gulf Marine Services, GMS Endeavour is a self-propelled, self-elevating offshore platform equipped for marine construction and maintenance work. According to the operator's technical specification, its hull measures 76 metres long and 41.5 metres wide, while each of its four lattice legs is 94.2 metres long.
The legs can be lowered to the seabed, allowing the hull to be jacked above the water to create a stable working platform. The vessel is designed for operating water depths of up to 65 metres and is equipped with a main crane rated at 230 tonnes, a working deck of 1,035 square metres and accommodation for up to 246 people, depending on configuration.
AIS voyage information indicates that the Panama-flagged platform travelled to Dún Laoghaire from the Walney offshore wind farm area in the Irish Sea, departing on 9 November. The Liverpool Bay assignment has been identified separately by a harbour source.
Previous Jack-Up Visitors
The dramatic arrival follows earlier visits by specialist offshore platforms. As Afloat reported in September 2025, the Danish jack-up vessel Wind Server berthed at Dún Laoghaire, where its towering legs and heavy-lift crane similarly dominated the waterfront.
In June 2024, the jack-up barge Sandpiper was mobilised from Dún Laoghaire for geotechnical investigations associated with the Dublin Array offshore wind project. Elsewhere in Dublin Bay, the jack-up barge OCM 80 undertook site investigations for the Codling Wind Park project in 2022.
The current visit is understood to be a mobilisation stop ahead of the Liverpool Bay repair work, rather than a local offshore construction project.
