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

Orient Adventurer (Polar Onyx)

Delivered as a high-capacity flexible pipelay/subsea construction vessel for harsh conditions and deep waters for operations in the SURF/Construction/IMR market. In 2024, she was converted to a cable lay vessel.

Vessel Type
Related Solutions
Owned By
Dong Fang Offshore
Built By
Ulstein Verft AS
Yard Number
IMO Number

Primary Specifications

130 m
25 m
Dead weight
8,207 tonnes
7 m
15.1 kn
130 people
Deck area
1,700 sqm

Additional Data

Operating depth
Fuel oil (MDO)
Fresh water
Ballast water/Drill water
Highest standard of dynamic positioning
DP3 / Operation+
VLS system for installation of flexible pipe and umbilicals (50 - 630mm OD)
Note: Specifications may have changed since the original completion date.
Classifications: DnV1A1, SF, E0, DYNPOS-AUTRO, CleanDesign, NAUT-OSV(A), COMF-V(3), COMF-C(3), HELDK-SH, CRANE, SPS, VIBR, BIS, DK(+)

Ship history

Ship history:

IMO number:  9664706

2014, 4 March:
The ship, originally named 'Polar Onyx', was another on-time delivery from Ulstein Verft. Ceona chartered the vessel for a fixed period of five years. After delivery, a 275t vertical lay system was installed before she entered operations in May 2014. Her first assignment was to deliver deepwater SURF services to Petrobras offshore Brazil. Steve Preston, CEO at Ceona, said: "We are delighted with the on-time delivery of the 'Polar Onyx'.

The SX121 design has a high capacity for flexible pipe cargo below and on the main deck. The X-BOW ensures excellent sea-keeping capabilities and fuel efficiency. Polar Onyx has been built to the highest standard for station keeping, redundancy and dynamic positioning with DP3 and Operation +, providing reliability in operation. 

Irene W. Basili, CEO of GC Rieber Shipping, stated: "The vessel is designed to meet the increasing expectations from our clients in the high-end subsea segment regarding operational redundancy and flexibility. Our cooperation with Ulstein Verft has been excellent, which again has been essential for us in supporting our client.

"Polar Onyx" is certified according to Special Purpose Ships (SPS) and Clean Design and carries a Green Passport. She has an extensive construction/cargo deck area of 1,700 m2. She has an AHC offshore crane capable of lifting 250 tonnes at a 14-metre outreach and a 12-tonne AHC offshore crane. She carries two work-class ROVs, one to be deployed through a moon pool and the other over the starboard side.

November 2015: 
GC Rieber Shipping has taken over the Polar Onyx offshore construction vessel from Ceona. The first assignment after the take-over was a charter agreement with Marine Platforms Limited for a fixed period of 60 days starting in January 2016 and an option for up to 2 months of additional work. The assignment was to conduct flex-laying activities for Chevron offshore Nigeria.

February 2021:
Polar Onyx has been working for DeepOcean on deepwater oil and gas projects in West Africa since 2016, and this was recently extended to May 2021. In February 2021, GC Rieber Shipping announced another contract for the vessel from a Tier 1 subsea contractor for a firm duration of three months in the North Sea, starting on 1 July 2021. The assignment includes options to extend this into Q4 2021.

December 2021: 
GC Rieber Shipping has sold the Polar Onyx to Taiwan-based offshore wind service player Dong Fang Offshore, a subsidiary of Hung Hua Construction. Delivery took place in February 2022. The vessel will be working on a 2022 construction campaign in Taiwanese waters. Her new name is Orient Adventurer.

March 2024: 
Seaway7 announced that after less than 6 weeks of work at the ST Marine shipyard, the vessel has been converted into a cable layer (CLV) and will start working at the Yunlin offshore wind farm. She will carry out cable-laying under the partnership between Orient Adventurer‘s owner, Dong Fang Offshore (DFO), and Seaway7, which signed a memorandum of understanding (MOU) on collaboration in the Taiwanese offshore wind market in February. According to Seaway7, the vessel is a product of this collaboration as the conversion involved using Seaway7 cable lay spread and DFO’s vessel to create a dedicated cable laying asset for Taiwan.