Define the cable task by route and location
SVC links each dive task to the cable identification, route drawing and a defined location such as chainage, coordinates or a structure entry. The client identifies whether the work concerns installation support, an exposed section, a protection component or an observed defect. This keeps the diving work connected to the cable contractor’s method and the asset owner’s operating arrangements.
Send the latest route position list, cable specification, relevant crossing or entry drawings and available survey results. Record the coordinate reference system and drawing revision. An apparent discrepancy between a surface position and the route record needs reconciliation before underwater intervention is planned.
Diving attendance during installation
Our divers assist at specified underwater interfaces when the installation method requires close observation or manual work. The task may concern a protection component, accessible connection or nominated cable-entry area. The cable contractor defines the approved sequence, permissible handling and acceptance points; SVC prepares the corresponding dive attendance.
Cable laying, tensioning, winches, suspended loads and vessel positioning affect the dive area. The work plan establishes when equipment is secured and when the diver may approach. Limits on cable movement and component handling come from the cable and protection-system requirements.
Inspect exposed cable and protection components
SVC records the visible condition of agreed exposed sections, protection systems and accessible entries. The report identifies location, apparent displacement, abrasion, missing or damaged protection and contact with debris where observable. The worklist specifies what dimensions or clearances need measurement.
Marine growth or sediment may limit what is visible. Cleaning or local exposure requires an agreed method that protects the cable and its surrounding system. The team records the actual access and visibility so a hidden area is not reported as inspected.
Buried cable location needs suitable survey methods
A diver’s visual inspection cannot establish the route or burial depth of a cable that remains below the seabed. Cable tracking, burial-depth assessment and wider route surveys require appropriate instruments, methods and coverage. Those survey tasks should have their own deliverables and positional accuracy requirements.
SVC coordinates close visual attendance with the survey results. If a potential free span is identified, record its location and agreed dimensions for engineering assessment. The cable engineer determines whether the condition needs further investigation or remedial work.
Electrical status and isolation before intervention
The asset owner’s authorised electrical team establishes the cable’s status, relevant isolations and work controls. SVC’s diving supervisor reviews the resulting conditions with the cable and marine teams before authorising the dive. The project work plan must address the risks of power cables and nearby electrical sources.
Cable jointing, electrical testing, fault location and energisation require the appointed specialist scope. A diving inspection does not certify insulation condition or authorise a cable to be energised. The completion record keeps underwater observations distinct from electrical test results.
Remedial work follows the engineered method
If an inspection identifies displaced protection or an exposed section, SVC develops the diving attendance around the engineer’s remedial design. The work package specifies materials, lifting, access, installation checks and the record required after intervention. Reburial, trenching, rock placement and cable repair are separately defined specialist activities.
For a route approaching a turbine foundation, connect the cable inspection with the underwater foundation worklist. This helps the project inspect the interface without losing the individual cable and structure references.
What should a cable-diving report identify?
The record identifies the cable, route revision, inspected location, date, conditions, method and work performed. Images and video are linked to individual observations, with measurements where commissioned, visibility limits and follow-up items. The survey report and electrical records remain identifiable supporting documents.
When should cable areas be revisited?
Plan inspection at relevant installation handovers, scheduled asset inspections and after events that may affect the route, such as severe weather, anchor interaction or nearby works. The owner and cable engineer set the locations and timing using risk and previous findings. Underwater O&M planning connects these records to the wider asset programme.
What is needed to quote the diving scope?
Email [email protected] the cable IDs, route data, task locations, drawings, water-depth information, electrical status, proposed isolation arrangements and work window. Identify the cable contractor, responsible electrical party, survey requirements and expected completion documents.