Two North Sea signals on subsea removal cost, and what a Gulf bidder can borrow

Subsea decommissioning rarely comes with a price tag attached. Contract values stay private, and operators do not publish what they paid. So when a contractor discloses even a range, people notice.

Two North Sea items from October 2026 offer partial signals. One is a contract award disclosed by band. The other is a rental model that lets recovered equipment offset cost. Both are useful to a Gulf of America bidder. Neither is a Gulf price, and reading them as one would be a mistake.

Signal one: DOF’s “significant” award

Norway’s DOF Group announced a contract it describes as “significant” to deliver a subsea decommissioning campaign for an unnamed North Sea operator. DOF defines a significant contract as one with a value between $15 million and $25 million.

The scope, as reported, covers project management, engineering, offshore execution and disposal services. The work is the removal of subsea infrastructure and seabed clearance across multiple offshore fields. DOF plans to combine in-house engineering, project management, marine operations, ROV services, survey and offshore execution. One of its construction support vessels (CSVs) will do the offshore work. The campaign is expected in the first quarter of 2027.

What the band does and does not show

The $15–25 million figure is a disclosure threshold. It tells shareholders which size bucket the award falls into. It is not a quoted price, and it is not an average.

It also does not divide cleanly. The award covers several fields, an unstated number of structures, and a full service stack:

• project management and engineering;
• a CSV spread and its marine crew;
• ROV and survey work;
• removal execution;
• disposal of recovered material.

We do not know the number of items removed, their weight, the water depth, the vessel days, or how disposal is priced. Without those, the band cannot become a per-structure, per-tonne or per-day rate. Any such rate built from it would be invented.

What the band does show is narrower and still useful. A multi-field subsea removal and clearance scope, delivered by one integrated contractor from one vessel in one season, cleared DOF’s significant threshold. That is evidence about bundling, not unit cost. The operator chose to buy engineering through disposal as one package rather than splitting it.

Signal two: Legasea’s rental-to-reuse credit

Legasea, a subsea equipment specialist, launched a basket rental service for decommissioning and seabed clearance projects. The fleet is five subsea baskets, sourced surplus from a major oil and gas operator and refurbished by Legasea. Each basket is rated for a 5,000 kg maximum payload (7,500 kg maximum gross weight) and carries a unique identification number for traceability.

The commercial feature is the credit. When baskets come back carrying recovered subsea equipment, Legasea assesses the items at its permitted Westhill facility. Equipment that can be cleaned, refurbished and recertified is credited against the client’s rental. Legasea says this can significantly reduce the net cost of the baskets, depending on what is recovered.

What the credit does and does not show

The terms carry the limits. Credit depends on equipment type, condition and assessment outcome, and is subject to agreed terms. NORM-contaminated items are not accepted, although permitted sub-contractors can manage them if required.

So the offset is conditional on three things. The recovered item must have a reuse market. It must survive recovery in a condition worth recertifying. And it must be clean of naturally occurring radioactive material. Much recovered decommissioning hardware will fail one of those tests. No figure for typical credit value was published.

The signal is not that rentals are now free. It is that a supplier sees enough reusable hardware in clearance scopes to price against it. It also shows where the cost pressure in seabed clearance is being felt: in the recovery and handling equipment, not only in vessel time.

See which Gulf campaigns are moving towards removal and clearance, by operator, block and stage. Open a free account →

Why neither number crosses the Atlantic

A Gulf bidder should resist importing either signal as a benchmark. Four differences sit underneath them.

Regulation. Gulf removal and clearance are governed by 30 CFR Part 250, Subpart Q. Since 10 July 2026, the agency administering it is the Marine Minerals Administration, formed when Secretary’s Order 3451 reunified BOEM and BSEE. North Sea scopes are defined under a different regime, with different clearance and disposal obligations.

Clearance scope. Gulf site clearance has fixed radii, a two-direction trawl pattern on the shelf, positioning accuracy and a certification pack. Our site clearance explainer sets those out. “Seabed clearance” in a North Sea award may not mean the same deliverable.

Vessel market. A CSV with ROV and survey on board is one spread type. Much Gulf shelf clearance is done by trawl vessels and lift boats, which price very differently.

Disposal and reuse routes. Legasea’s credit depends on a permitted facility and a reuse market near the work. Whether an equivalent route exists for a given Gulf scope is a separate question; the sources reviewed for this post do not establish one.

Where Gulf cost is actually visible

The Gulf has something the North Sea items do not: a public, model-based cost reference tied to individual facilities.

The regulator’s probabilistic decommissioning cost estimates are built from operators’ reported actual expenditures, not vendor quotes. They are published as percentiles, and the percentile in use is a policy choice. Our P50 vs P70 vs P90 explainer covers how that works and how it feeds financial assurance; actual outturns show why even a public model is not a bid.

Two cautions apply. First, a P-value is a modelled exposure for a facility, not a tender value. Second, it prices scope, not procurement. It does not tell you whether a campaign is contracted, bundled, or still unplanned. Our methodology keeps a modelled cost figure separate from an observed procurement signal for that reason.

Read together, the three sources answer different questions. The P-value gives a defensible order of magnitude for a Gulf facility. The DOF band shows how one North Sea operator packaged a multi-field scope. The Legasea credit shows one place a contractor might recover margin.

What a Gulf bidder can borrow

1. Borrow the packaging, not the price. DOF’s award shows an operator buying engineering, execution, survey and disposal from one contractor. Ask whether your target operator buys that way, or splits scopes.
2. Price clearance as its own line. Do not let it hide inside a removal number. Gulf clearance has a defined method, radius and certification, and each one costs.
3. Count the fields and the circles. “Multiple fields” in one season is a mobilisation argument. In the Gulf, adjacent well and platform circles in one block are the equivalent.
4. Test recovered hardware for reuse value early. If an item could be refurbished, identify it in the plan. Treat any credit as conditional until assessed.
5. Screen for NORM before you count on an offset. Contaminated items fall out of reuse schemes and need a separate, permitted handling route.
6. Anchor your estimate to the public P-value. Use it as a sense check against your own build-up, and state which percentile you used.
7. Never quote a North Sea figure as a Gulf rate. If you cite DOF’s band in a proposal, cite it as a disclosure category from a different market.

The honest reading

These are thin signals. One is a size bucket with no breakdown. The other is a credit with no published value. Both are still more than the public record usually gives on subsea removal and clearance cost.

Their real value is in the questions they raise for a Gulf proposal. How is the scope packaged? Where does clearance sit? What can be recovered and reused? Those questions are answerable for a specific Gulf campaign from the filings. See how one campaign’s structures, stages and modelled cost read together in a sample Opportunity Brief.

Sources

• DOF Group, DOF Group ASA — Awarded Subsea Decommissioning Contract in the North Sea (12 October 2026) — "significant" band of $15–25 million, scope, CSV and Q1 2027 timing.
• Legasea, Subsea Baskets: Rental for seabed clearance, with credit for reusable equipment — payload, gross weight, traceability, reuse credit terms, permitted facility and NORM exclusion.
• Electronic Code of Federal Regulations, 30 CFR Part 250, Subpart Q — Decommissioning Activities.
• U.S. Department of the Interior, Secretary's Order No. 3451, "Establishment of the Marine Minerals Administration", 10 July 2026.
• GOMDecom, P50 vs P70 vs P90: how BSEE estimates decommissioning costs and the last 60 days: what site clearance verification actually requires.