The Tool Desk
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What the installation has to achieve
A subsea power cable must follow a route that can be installed and maintained while limiting exposure to hazards on or near the seabed. That involves more than lowering cable into the water. The project has to determine where the cable should run, what seabed conditions it will encounter, how it will reach shore or an offshore asset, and what protection is appropriate along each part of the route.
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CIGRE Technical Brochure 883, published in 2022, sets out common guidance for engineering, tools, and execution. Its scope includes utility and renewable-energy export and inter-array links, interconnectors, and other applications. It is guidance, not a universal installation prescription: the final method depends on the specific project and its governing requirements.
In practice, the work is a connected sequence. Survey data informs route selection; the route and its hazards inform protection planning; preparation and vessel access affect how cable can be laid; burial or other protection must preserve cable integrity; and post-installation checks document the result.
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How the route is surveyed and selected
Route planning begins with a picture of the seabed and the conditions the cable is likely to encounter. Geophysical survey data is used to develop that picture and guide geotechnical sampling. Project teams integrate and analyze the information to choose a detailed alignment within a broader corridor.
The route is not selected on seabed shape alone. Relevant factors identified in CIGRE guidance include:
- Water depth, seabed temperature, and thermal resistivity.
- Seabed type and conditions down to the intended burial depth.
- Obstacles and boulders, as well as possible unexploded ordnance.
- Crossings with other assets, shipping channels, and anchorages.
- Slopes, currents, and exposure to waves.
These factors matter together. For example, the seabed conditions bear on whether burial is feasible, while an existing asset crossing adds a need to coordinate separation and protection. Water depth and exposure affect what vessels can reach the route. A route that appears shorter may therefore be less suitable if its local conditions create harder installation or protection problems.
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Once the route is understood, designers assess external threats and decide how to address them. CIGRE describes approaches such as a Cable Burial Risk Assessment (CBRA) or other risk-based burial-depth studies. These evaluate the probability and consequence of hazards and use that assessment to recommend mitigation. The assessment is segment-specific: different stretches of one route can warrant different treatments, and some sections may need no additional burial or protection.
Burial places the cable into the seabed and is described by CIGRE as the most common protection method where reasonably possible. It can reduce exposure to external threats such as demersal fishing and dragged anchors. Whether it is reasonably possible depends on local seabed and project conditions, as well as water depth, cost, and the risks being addressed.
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Where burial is infeasible, or where the protection plan calls for additional measures, CIGRE lists route selection, rock placement, mattresses, and cable protection systems such as protective shells around the cable. These are not interchangeable answers with a universal ranking. The choice has to reflect the threat, seabed suitability, cable integrity, nearby infrastructure, and what future inspection or repair may require.
Comparing protection options
| Approach | How it helps | Project considerations |
|---|---|---|
| Burial | Places the cable into the seabed and can reduce exposure to external threats such as demersal fishing and dragged anchors. | Depends on whether the seabed and project conditions allow burial to the planned position; installation forces and later changes in cover also matter. |
| Rock placement | Provides protection on the seabed where the project design uses rock rather than relying solely on burial. | Must be planned for the local threat and coordinated with crossings and future inspection or reinstatement needs. |
| Mattresses | Can be used as a seabed protection measure where specified by the design. | Suitability is project-specific; the design should account for cable integrity and interaction with nearby assets. |
| Cable protection systems | Protective shells around the cable are among the systems CIGRE identifies for seabed protection. | Selection depends on the local conditions and the protection objective for that route segment. |
| Route selection | Adjusting the alignment can help avoid or manage hazards before installation. | Must be reconciled with the wider route corridor, seabed survey findings, and crossings or access constraints. |
The table describes categories, not a universal cost or performance comparison. The evidence does not establish a numeric score or general cost ranking for these alternatives. At crossings, project teams need arrangements with the owners of existing assets so that the installation maintains appropriate separation and protection.
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There is no universal numeric burial depth established by the guidance summarized here. A depth recommendation follows from identifying hazards, estimating their likelihood and consequence, and deciding what mitigation is appropriate. The relevant hazards and seabed conditions may vary over short distances, so a single value applied to an entire route can misrepresent the design problem.
A burial-depth study is therefore a project assessment, not a lookup of one generally applicable number. Its recommendation needs to reflect the route segment, the seabed down to the intended depth, the threats being mitigated, and the practical limits of the installation method. Where burial is not achievable or does not address the relevant risk adequately, another protection measure or a combination of measures may be considered.
Regulatory or project-specific requirements can also determine what applies to a particular installation. A depth should not be presented as a general rule unless a source for the relevant project or jurisdiction supports it.
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How the seabed and landfall are prepared
Before cable laying, project teams prepare the route, address obstacles and crossings, and coordinate the shore works needed to pull the cable to land or connect it to an offshore asset. Preparation matters because the lay vessel, the cable route, and the landing method have to work as one installation plan.
Landfall sequencing can be especially important where trenchless solutions or ducts are used. The cable may need to be pulled through a prepared path, so the shore-side work and offshore laying operation must be coordinated. The evidence does not prescribe one landfall arrangement for all projects; the sequence depends on the chosen design and site conditions.
Crossings also require advance coordination. A route crossing another asset is not simply a point where the cable passes over or near existing infrastructure: the project needs an arrangement with the asset owner to maintain separation and protection. Identifying crossings during route planning gives the installation team a basis for preparing the relevant section before the cable reaches it.
How a vessel lays the cable
Cable is laid from a cable-lay vessel or barge selected for the route and access conditions. Vessel choice involves trade-offs. A shallow-draft vessel can reach shallower areas, but it can be more exposed to waves and swell. A larger offshore vessel may operate in rougher conditions, yet be unable to approach the landfall closely. This is one reason the final approach to shore may need to be coordinated with separate shore works or another part of the installation plan.
The lay operation must place the cable along the selected route while accounting for the protection method that follows or accompanies laying. For buried sections, the cable has to reach the planned position in the seabed. The selected tool and its movement along the route must be compatible with the seabed and must not introduce unacceptable forces to the cable.
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Vessel access is therefore not a detail that can be considered after route selection. Water depth, weather exposure, and proximity to shore affect the equipment that can reach each part of the route, and those constraints need to be considered alongside the route and protection design.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How burial tools work
Burial tools penetrate and move along the seabed while guiding or allowing the cable to reach its required position. Depending on the conditions, a tool may be towed, self-propelled on tracks or thrusters, or suspended from a vessel. The method selected has to suit the seabed and the intended installation depth while protecting the cable from installation forces.
Common penetration mechanisms
- Ploughing: a plough penetrates the seabed and creates a path for the cable as it advances.
- Water jetting or fluidising: water loosens or fluidises seabed material so the cable can reach the trench position.
- Chain cutting: a chain-based mechanism cuts into the seabed as the tool advances.
- Wheel cutting: a wheel-based mechanism cuts into the seabed.
- Combined mechanisms: tools may combine more than one method to achieve penetration and cable placement.
Once a trench or path is created, the cable may sink into suitably fluidised material, or an enclosed stinger or blade may guide it down. The mechanism is only part of the design: the tool must penetrate to the planned depth, position the cable there, and advance along the route without compromising cable integrity. CIGRE emphasizes assessing forces that the tool may introduce to the cable.
How installation is checked and recorded
After laying and protection work, commissioning or post-installation checks aim to confirm that the cable was installed without damage and is ready for service. An as-laid survey records where the cable was actually placed. Consolidated as-built route information brings the final position into the project record, providing a reference for later inspection and maintenance.
Surveying can also identify free spans, where a section of cable is unsupported above the seabed. CIGRE notes that free spans can create mechanical fatigue or failure risks and may need remedial work. A route record is therefore not just an administrative close-out: it helps show whether the installation matches the intended arrangement and where follow-up may be needed.
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The post-installation stage should be understood as verification and documentation, not a guarantee that no future intervention will ever be needed. Seabed conditions and cable cover may need to be checked over the asset life, and a fault repair can involve very different work from the original installation.
What maintenance and repair can involve
Planned maintenance can include survey campaigns and landing inspections, reburial where cover has reduced, removal of additional cover, and reinstatement of a rock berm. Which work is needed depends on what inspection finds and on the original protection design.
If a cable fault occurs, repair work varies widely with cable and route complexity, vessel and spare availability, weather, and other conditions. There is no single standard repair duration that can be applied to all subsea power cables. The as-built route information and the record of protection measures are useful context for planning later work, but they do not remove the need to assess the actual fault and conditions at the time.
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How cable standards relate to seabed protection
IEC 63026:2019 specifies test methods and requirements for extruded-insulation submarine power cable systems rated from 6 kV to 60 kV. Its catalog description applies to fixed, permanently submerged installations up to 250 m water depth and notes that dynamic applications connected directly to floating structures may need modified or special test conditions.
This is a defined cable-system standard, not a general rule for burial depth or seabed protection. Whether it applies to a specific installation depends on the cable system and project requirements. Check the IEC lifecycle page and the governing project requirements before treating the 2019 edition as current or applicable to a particular project.
What to take from the installation sequence
Subsea cable installation is planned around the route first and the protection decision second: survey and sampling reveal the seabed and constraints; risk assessment informs segment-by-segment mitigation; route and landfall preparation enable laying; vessels and burial tools are selected for access and seabed conditions; and post-installation checks record the final route and identify issues such as free spans. Burial is common where practicable, but the appropriate depth and method are project-specific. Rock, mattresses, cable protection systems, and route adjustments may also form part of the design.
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