Polar Onyx, a subsea vessel of the SX121 design, owned by GC Rieber Shipping, photo: Marius Beck Dahle.

Subsea Support

The 'Seven Viking' subsea vessel, photo: Christian Romberg

Designs that move the industry forward

Explore our portfolio of subsea support vessel designs.

SX121 - Island Performer.

The role of subsea support vessels in the offshore energy industry

Subsea support vessels encompass a variety of specialised ships designed to support various operations related to subsea construction, maintenance, and exploration. These vessels are tailored for specific tasks and environments in the offshore energy industry. 

Our designs give high functionality, large work deck and equipment-carrying capability and good seakeeping abilities to ensure high operability under harsh weather conditions, high transit speed and low fuel consumption.

Marine Automation System based on ULSTEIN X-CONNECT_Ulstein and Eggs

System integration

Cutting-edge solutions that optimise vessel performance and enhance operational efficiency. 

News & featured articles

Turning visions into realities motivates us to keep pushing for progress in the maritime industry. 

You can learn more about how we work with our customers to achieve their visions through our stories. 

JSD6000 delivery 2 2880px

Delivery ceremony of the deepwater derrick lay vessel JSD6000

The delivery of the JSD6000 deepwater derrick lay vessel on May 28, 2024, marks a significant milestone in maritime engineering. Developed by Ulstein Design & Solutions B.V., the vessel’s design is a customized iteration of the SOC 5000 heavy lift vessel tailored to meet SAIPEM’s operational needs. 

Concept design ULSTEIN THOR replenishment powering

Thorium-powered: ULSTEIN THOR zero-emission ship concept sparks major interest

Since unveiling the Thorium-powered ULSTEIN THOR design in April 2022, we have been swept by a wave of interest in the concept vessel and its unparalleled potential and capabilities. Set in a polar cruise context, ULSTEIN THOR alone could generate over 50 GWh of energy in a single 150-day cruise campaign. The result would be a significant environmental impact in Antarctica, with over 32,000 tonnes of CO2 emissions prevented.

Events & conferences

We will be attending many events and conferences, which can be an excellent opportunity to meet. See if we are participating in any upcoming events you are going to. 

03.09.2024 - 06.09.2024
Messeplatz 1, 20357 Hamburg, Germany
Wind Energy
24.09.2024 - 27.09.2024
Stephansplatz, Hamburg, Germany
Energy Taiwan
02.10.2024 - 04.10.2024
No.2, Jingmao 2nd Rd., Nangang District, Taipei, Taiwan

Ulstein Design & Solutions AS


Ulstein Design & Solutions B.V.