Pelagian provides comprehensive expertise in the planning, design and construction of submarine cable systems. With over 25 years of industry experience, our consultants can contribute to every aspect of your engineering project; providing the relevant technical and commercial knowledge every step of the way.

Cable Route Engineering

Pelagian’s route engineers can call on over 25 years of experience in the successful design, planning, survey and installation of submarine cables. This expertise has been gained on a variety of projects in telecoms, renewable energy, oil and gas and offshore power; from small domestic cables, through to large transoceanic and multi country network systems.

Cable Route Studies

Pelagian’s cable route studies provide a valuable desk top resource for the planning and route selection of submarine cable systems. They provide an assessment of both natural and manmade hazards and also information on the regulatory and environmental requirements for the cable route.
Information is obtained from a variety of in-house and commercially available databases, academic papers and industry guidelines. Data includes seabed bathymetry, seafloor sediment mapping, meteorology, ocean currents and tides and fishing, shipping and the activities of other seabed users.
As part of the cable route study Pelagian undertakes site visits to investigate suitable beach landings, location of terrestrial infrastructure and the proximity of existing cable landing stations and facilitates meetings with regulatory, environmental and commercial interests.

Risk Management and GAP Analysis

Pelagian are leading industry experts in subsea cables, supplying a comprehensive risk management approach to cable projects at all stages of the life cycle. This risk management of subsea cable engineering encompasses a technical and commercial review of the project as a means of classifying how well a product, dataset or solution meets the needs of the project.
The GAP Analysis is used to highlight areas of deficiency or omission, where additional information would provide a better end product. Pelagian relies on its broad knowledge base and the practical expertise of our specialist consultants to identify where design, manufacturing, survey and installation can be improved to the benefit of the project.

Case Study: Iraq ICOEEP Cable Burial Risk Assessment

Pelagian was contracted to provide expert personnel and consultancy services for the installation and remedial works for the Iraq Crude Oil Export Expansion Project (ICOEEP), located off the Shatt-al-Arab in the Persian Gulf.
Project work included provision of offshore client representatives to oversee the works and subsequent analysis of cable burial. As part of the analysis of the cable installation works, Pelagian conducted a detailed cable burial risk assessment.
The risk assessment considered the external threat to the installed cables from external factors such as shipping and fishing and formulated a remedial burial plan for the cables. The project highlighted challenging burial conditions close to existing pipelines and considered the long term operation of the cables in a busy and complex oil & gas shipping zone.

Case Study: Rampion Offshore Wind Farm Cable Route Engineering

Pelagian provided a detailed GAP Analysis, cable route engineering and cable burial risk assessment consultancy services to the Rampion Offshore Windfarm.
Project work included the design and layout of the export and array cables and geospatial data management and expert recommendations for suitable cable burial equipment and techniques to inform the tendering process prior to cable installation.
The route engineering encountered challenging seabed conditions requiring the careful planning of the wind farm array cables in 20-40m of water around planned jack up locations and avoiding underlying paleochannel areas.


Case Study: Personnel and Consultancy Services for Hibernia Express

Pelagian provided expert consultancy services and personnel to the Hibernia Express project, the first trans-Atlantic telecom cable to be installed for over 10 years on a unique low latency route laid in very challenging seabed conditions.
Pelagian’s consultancy services included the management of survey and installation programs, permitting research and stakeholder management including the preparation of Notice to Mariners and information for the public.
During the 2 year project, Pelagian provided key personnel for the survey and installation campaigns and contributed to the success of the Hibernia Express project, which was awarded “Project of the Year – Subsea” and “Best Subsea Innovation” at the Global Carrier Awards in 2015.

Case Study: Due Diligence Consultancy Services German Offshore Wind Farm

Pelagian were contracted by a major German offshore wind farm developer to provide expert consultancy services for the tendering phase of the project.
Pelagian provided a detailed review of the technical and commercial tenders for the laying of subsea cables on the project and analysed the capabilities of the cable laying techniques offered.
The client was fully briefed on the suitability of the tenders by utilising a detailed bid scoring system developed for the project.

Case Study: Personnel and Consultancy Services for Gwynt Y Mor

Pelagian provided consultancy services and key personnel to the Gwynt Y Mor project during the planning and construction phases. Gwynt Y Mor is one of the world’s largest offshore wind farms and was completed in 2014.
Pelagian’s expert consultancy services included detailed route engineering and cable burial assessment for the export and array cables, geospatial data management for survey and construction data and providing expert advice on cable burial equipment and installation methodologies to advise the tendering process.
Pelagian provided numerous offshore based technical personnel for the project, including client representatives and engineers for geophysical surveys, cable lay and foundation installation works during the project.


Case Study: Italy to Tunisia Power Cable Permit Study

Pelagian were contracted by a major international engineering consultancy to provide expertise on permits for a proposed HVDC power cable between Italy and Tunisia in the Mediterranean Sea.
The study researched the maritime jurisdictions of each of the countries crossed by the proposed cable and the permitting and regulatory requirements for the survey and installation of a subsea power cable.
The work scope also researched the environmental requirements at the landing points and coastal shelf areas and also stakeholder requirements for the crossing of a significant number of active telecom cables and oil/gas lease blocks.

Case Study: Main One Geophysical Survey

Pelagian in partnership with a major international survey company, successfully bid for the Main One Cable Route Survey in 2008. This was a significant landmark in Pelagian’s history and the company’s largest single contract award at that time.
The scope of work comprised geophysical surveys for the Main One cable system from Portugal to Nigeria from landing point to deepwater. Pelagian provided expertise in cable route engineering and landing point selection, operational permitting for the survey vessels and burial assessment knowledge to the CPT sampling campaign.
The project was successfully surveyed in 2009 without any delays caused by permitting or regulatory constraints, considered a first in West African cable survey experience. Pelagian also provided permitting expertise for the successful installation of the cable in 2010.

Case Study: Sakhalin Island Kirinskoye Umbilical Cables

Pelagian were contracted to provide route engineering services to the installers for umbilical cables, subsea distribution units and subsea manifolds as part of the Kirinskoye Gas Project located 30km east of Sakhalin Island in the Russian Pacific.
Pelagian’s work scope comprised the detailed route engineering of the umbilical cables to be laid into pre- cut dredged trenches This project presented a number of technical challenges including the translation of documentation from Russian, geospatial data management of dredging data and seabed infrastructure and engineering cables to withstand life in harsh environmental conditions, where ice and earthquake activity is commonplace.
The umbilicals were successfully installed in 2012 in water depths up to 90 metres. This project marked the first time that gas was extracted by a subsea production facility on the Russian shelf

Case Study: Middle East Cable Route Studies

Pelagian have compiled numerous Middle East based Cable Route Studies in the last 10 years for telecom customers, planning multi landing cable routes in Egypt, Saudi Arabia, Yemen, UAE, Qatar, Oman, Bahrain, Iran and Pakistan.
The Cable Route Studies provided a resource of information regarding natural and manmade hazards to the cables, permitting and environmental considerations and the design of cost effective and efficient routes to a variety of different landing countries.
Pelagian supported these projects with a proven track record of project work in the Middle East combined with an intimate knowledge of business practices, permitting and regulatory considerations and system security.

Case Study: Mediterranean Cable Route Studies

Pelagian have compiled numerous Mediterranean based Cable Route Studies in the last 10 years for telecom customers, planning trunk and spur cable routes from Northern Europe to Southern France, Italy and Spain across to Egypt, Turkey and Cyprus.
The Cable Route Studies provided a resource of information regarding natural and manmade hazards to the cables, permitting and environmental considerations and the design of cost effective and efficient routes to a variety of different landing countries.
Pelagian’s expertise in cable landing selection, marine permitting and risk assessment helped to generate a variety of diversified routes across the Mediterranean, where space for new cables is becoming difficult to engineer and environmental legislation becoming much more significant for project planning.

Case Study: Gwynt Y Mor Cable Engineering and Data Management Services

Pelagian were contracted to provide detailed route engineering and cable burial risk assessment advice for the Gwynt Y Mor offshore wind farm project. This involved working with both the developer and cable installation companies to provide expert analysis of the seabed hazards for cable routes and wind turbine generator (WTG) foundations.
Project work included the collation of 10 years of geophysical survey data into a unified geospatial dataset, which was used to inform the export and array cable route planning and also construction phase works.
Pelagian’s knowledge of the project and expertise in handling this geospatial data greatly assisted in the planning of WTG construction and cable lay operations, while forming the basis for the developer’s own geographical information database and marine management systems.

Case Study: Java Bali Power Cable Route Engineering

Pelagian was contracted to provide expert cable route engineering services for the planned installation of two 5km long power cables between the islands of Java and Bali in Indonesia.
Project work included the geospatial data management of detailed high resolution seabed bathymetry and associated seabed images to determine the location of the existing power cables and plan the routes of the new cables.
The routes proved to be very challenging, with steep rocky slopes reaching depths of 80 metres. The cables were planned to avoid suspensions and sharp rock outcrops so that they could be rock dumped after lay. Pelagian provided an expert analysis of potential cable spans to assist in the cable lay.

Case Study: Irish Sea Offshore Wind Farm Cable Route Engineering

Pelagian has been providing cable route engineering support to numerous offshore wind farms in the Irish Sea since 2009, including Walney, Ormonde, West of Duddon Sands and Gwynt Y Mor.

Project work has included the design and layout of export and array cables, landing point optimisation, selection of burial equipment and burial assessment, managing cable crossings over existing seabed infrastructure and geospatial data management.

The seabed in this region provides a number of challenges for cable installation and burial, where mobile sediments, glacial till and boulders are commonplace. The cable route layouts and selection of burial equipment were designed to take into consideration the prevalence of these hard ground conditions and mobile sediments.


Case Study: Isle of Wight Telecom Cable Route Study

In 2014 Pelagian were contracted to research a desk top cable route study for two new domestic fibre-optic cables between Portsmouth on the UK mainland and Ryde on the Isle of Wight.

The Solent was a challenging area for the study. The routes sympathetically considered the important coastal habitats and also numerous marine activities. These included fishing, commercial shipping, recreational boating and yacht races and the planned Portsmouth regional dredging campaign.

The two cable routes were chosen to minimise the impact of both natural and manmade hazards present in the Solent and provide safe and diversified routes between the UK and the Isle of Wight, protecting internet connectivity for the local population.


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