Allseas begins construction of heavy-transport vessel for offshore megaprojects

Guangzhou Shipyard International has started building Allseas' new Grand Tour heavy-transport vessel, designed to move ultra-large offshore structures and transfer them directly to Pioneering Spirit for installation.
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Oct. 5, 2026
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Why this news matters:

  • The vessel is designed to transport some of the industry's largest offshore structures, including next-generation 2-GW offshore wind converter platforms. 

  • Its ability to fit within the bow slot of Pioneering Spirit could streamline offshore installation logistics and reduce project complexity. 

 

Courtesy Allseas
heavy-transport vessel with TenneT 2-GW Topsides

Allseas' new Grand Tour semisubmersible heavy transport vessel is designed to transport massive offshore structures, including next-generation offshore wind converter platforms, and transfer them directly to Pioneering Spirit for installation. Construction is underway in China.

Project at a glance:

  • Vessel: Grand Tour
  • Owner: Allseas
  • Type: Semisubmersible heavy transport vessel
  • Capacity: Up to 60,000 mt
  • Dimensions: 230 m x 57 m
  • Delivery: First quarter 2028
  • Shipyard: Guangzhou Shipyard International, China

Guangzhou Shipyard International in China started construction last month of the new Grand Tour semisubmersible heavy transport vessel for Allseas.

The vessel, which will have a carrying capacity of up to 60,000 mt, has been designed to transport very large offshore structures, including next-generation 2-GW offshore wind converter platforms.

It will be 230 m long and 57 m wide, and it has been engineered to fit inside the bow slot of Allseas’ flagship construction vessel Pioneering Spirit, allowing direct transfer of structures for installation.

By combining transport and installation capability, the company aims to offer more efficient and flexible delivery of complex offshore infrastructure, from fabrication yards to installation sites.

Grand Tour is due to be handed over in first-quarter 2028.

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About the Author

Jeremy Beckman
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Jeremy Beckman

Staff Writer / Editor, Europe

Jeremy Beckman has been Editor Europe, Offshore since 1992. Prior to joining Offshore he was a freelance journalist for eight years, working for a variety of electronics, computing and scientific journals in the UK. He regularly writes news columns on trends and events both in the NW Europe offshore region and globally. He also writes features on developments and technology in exploration and production.

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