C.S. Sovereign


C.S. Sovereign is a multi-role DPS-2 vessel capable of undertaking both cable maintenance and installation projects. Her open deck enables her to deploy a variety of subsea vehicles and her powered turntables make her the ideal solution for a diverse range of offshore engineering activities. C.S. Sovereign is primarily committed to serving ACMA, the Atlantic Cable Maintenance Agreement, and is based in Portland, UK.

C.S. Sovereign has been involved in many projects as well as being used as a charter vessel. Her accomplishments include: installation and burial of 30km of inter platform cable on the Fibre to Judy project in 2010 and completing the main lay installation operation, utilising the Atlas ROV and Cable Plough on the ValHall Clyde project.



Builders Van Der Giessen, Netherlands
Date built 1991
Flag UK
Class ABS, A1, Ice Class 1C, AMS, ACCU DPS-2
Length overall 130.70m
Breadth moulded 21.00m
Designed draft 7.014m
Gross tonnage 11,242t
Maximum speed 13.5kts
Main engines 3
Bow thruster 2
Stern thruster 2
DP system DPS-2 Duplex C-Series
Berths 78
Bollard pull 80t


Fuel capacity 1,108t MGO​


1 x  VSAT SEATEL 4006, MTN Service Contract on KU Band
2 x  Satcom B

Cable Tanks

Main cable tanks 2 x 2,300t powered turntables installed in C/Tks 1 & 3. Basket height 5.50m
Outer diameter 15.20m
Cone external diameter 6.00m
Maximum load per tank 2,200t
Wing tanks 2
Internal diameter 6.60m
Cone outer diameter 2.45m
Maximum load per tank 432t


Tampnet - North Sea

Oil & Gas

Project engineering overcomes the transportation and installation challenges of subsea structures.

Allseas Breagh - North Sea

Oil & Gas

Cable Innovator and C.S. Sovereign work together to deliver platform connectivity in the North Sea.

Horns Rev - North Sea

Offshore Renewables

Installing subsea cables at Horns Rev, Europe’s 1st commercial wind farm situated in the North Sea.

Estlink Cable - Baltic


The Estlink Cable provides vital infrastructure to supply the Nordic electricity market. 

Beatrice - North Sea

Offshore Renewables

Scottish Offshore Wind Farm Project relies on Global Marine for subsea cable expertise.

Hannibal - Mediterranean


Global Marine using Sovereign installs Fibre Optic Cable connecting Tunisia and Sicily.

Oil & Gas Telecoms Offshore Renewables Power Deep Sea Research