In short: The North Sea's first wave of oil and gas production is winding down, and the decommissioning programme that follows is one of the largest sustained engineering jobs the UK has ever taken on. ROVs surveying redundant subsea infrastructure, heavy-lift vessels removing topsides, supply chains tracking thousands of recovered components — all of it depends on offshore wireless connectivity that doesn't exist on the back of a 25-year-old platform. Private 5G is the layer that makes the modern decom toolkit work.
Key Takeaways
- UKCS decommissioning is a £40bn, 25-year job — and most of the platforms being removed were never designed with modern wireless connectivity in mind
- ROVs and inspection robots are doing more of the work — but they need real-time, high-bandwidth uplinks that satellite alone can't deliver economically
- Asset tracking from rig to yard is a cradle-to-grave audit problem — every recovered component needs a chain of custody that satisfies the regulator, the insurer and the recycler
In a nutshell
The decom decade(s)
The UK Continental Shelf has been producing hydrocarbons for sixty years. The first generation of platforms is now post-economic — operating costs exceed remaining production value — and entering the cessation-of-production (CoP) phase. The North Sea Transition Authority projects the total UKCS decommissioning bill at around £40bn through 2050, with the heaviest phase in the late 2020s and 2030s.
Decommissioning isn't a single project. It's a sequence: plug and abandon the wells, remove the topsides (the processing equipment above the waterline), recover the jackets and subsea infrastructure, decommission the pipelines, and remediate the seabed. Each phase involves heavy-lift vessels, ROVs, AUVs, divers, and an immense supply-chain operation moving recovered components to onshore yards for recycling, repurposing or disposal.
It's also a knowledge-management problem. The teams running today's decom programmes weren't necessarily on the original construction projects in the 1970s and 1980s. Drawings are partial, modifications were made over decades, and surveys are inconsistent. Modern decom relies heavily on remote sensing, AI image analysis, and a digital reconstruction of the asset as it actually exists today — not as it was originally designed.
All of this runs on data, and the data needs a network. Offshore, that network has historically been a mix of legacy ship-to-shore microwave, expensive narrow-band satellite, and intermittent VHF radio. None of it is fit for the data densities modern decom operations want.
ROVs are the workhorses — and they want bandwidth
The single biggest change in offshore work over the last decade is the rise of ROVs and AUVs. Subsea inspection that used to require divers in saturation now runs on remotely operated vehicles with HD cameras, multibeam sonar, laser scanners and increasingly AI-based defect classification running on the vehicle itself.
A modern work-class ROV can stream 4K video, multiple sonar feeds and high-rate telemetry simultaneously. The pilot — increasingly onshore in a control room rather than in a control van on deck — wants that data in real time, with low enough latency to make piloting decisions safely. The classifier that flags anomalies on a recovered pipeline wants every frame of the video review, not a 720p-compressed sample.
Today most of that uplink goes via a tether to the launch vessel and then via the vessel's satellite link to shore. Tether bandwidth is fine; vessel satellite bandwidth is not, and is wildly expensive at scale. The result is that ROV operations are throughput-constrained — pilots run lower resolutions than they want, AI inspection happens on a delay, and post-mission analysis is done after the vessel comes back to port instead of in real time during the operation.
A private 5G layer extending from a decom-base platform or a mother vessel changes the throughput economics. Within the operational cell — typically a few kilometres around an asset being decommissioned — every ROV, AUV, surface vessel and topside system runs on the same managed wireless network. Real-time uplinks happen at land-network bandwidths. Onshore pilots get HD video without compromise. Defect classification runs in the moment.
Heavy lifts: the most expensive minutes in the calendar
The single most expensive activity in a topside decom is the lift itself. A heavy-lift vessel like Allseas' Pioneering Spirit or Heerema's Sleipnir charges day rates that turn lost hours into seven-figure costs. The lift itself is a minutes-long operation that can only happen in tight weather windows, with positioning tolerances measured in centimetres, after months of preparation.
What goes wrong on a lift goes wrong fast. A grillage that doesn't seat correctly, a moonpool that has a fender contact, a sway response that exceeds the lift plan — each of these is a sensor signature long before it's a visual one. The vessel's own monitoring systems are excellent, but they're closed; the engineering teams in the operations centre onshore typically watch the same delayed video the rest of the world does.
A wireless layer that bridges the heavy-lift vessel, the platform itself, the standby vessels and the support fleet enables continuous shared situational awareness. The vessel's lift-plan sensors, the platform's structural monitoring (often added specifically for the decom phase), and the support fleet's positioning all feed into a shared real-time picture. The onshore engineering office sees what the bridge sees. Decision latency collapses. Weather windows get used more aggressively because the data confidence is higher.
From rig to yard: the audit trail problem
Once the topsides and jackets are on the dismantling yard's quay, the decom job becomes a materials-recovery job. UK regulation requires a defensible chain of custody for every component: where it was on the original asset, how it was decommissioned, what contaminants it carried, how it was handled and where it ended up. The Energy Act, OSPAR conventions and the relevant waste regulations all bake in audit requirements.
This is harder than it sounds. A typical North Sea topside has tens of thousands of distinct components. A jacket has more. Pipeline segments, valves, vessels, structural steel, instrumentation, cables — each gets recovered, transported, possibly cleaned and decontaminated, then either recycled, repurposed or landfilled. The audit trail has to follow the component from its original location offshore to its final disposition onshore.
The default approach is paper and spreadsheets, with periodic site audits by the regulator. The honest assessment is that it works imperfectly. The better approach is per-component RFID or QR tagging, scanned at every transition, with the data feeding a managed register that the operator, the regulator, the insurer and the recycler all access from the same source.
A private 5G layer at the decom yard makes this routine. Every component is scanned as it lands on the quay, scanned as it moves into the dismantling area, scanned as it's transported to the recycler. The data is real-time. The audit position is verifiable. And the same network covers the worker-safety wearables, the dust and noise monitors, and the CCTV — turning the dismantling yard from a series of paper exercises into a managed operation.
The energy-transition overlap
Decom isn't happening in isolation. The same waters where North Sea topsides are being removed are being filled with offshore wind farms, CCS injection wells, and emerging hydrogen infrastructure. Many decom operators are also the operators building the next generation of offshore assets — and many of the supply-chain businesses serving decom are also serving offshore wind.
That convergence matters for the network strategy. A private 5G capability designed for decom — ruggedised, salt-tolerant, fast-deployable, capable of bridging vessels and fixed platforms — is the same capability that offshore wind farms increasingly want for their own operations. The investment isn't single-use.
For UK operators positioning for the energy transition, the decom decade isn't a defensive cost. It's an opportunity to build the offshore digital capability that the next thirty years of offshore work will run on. The wireless layer is the spine of that capability.