Full Breakdown
Fatal Deck Grating Failure on Valaris 121 Leads to £287,025 Fine for Ensco Offshore UK
5/19/2026, 9:03:41 PM
Incident Overview
On 22 January 2023, Jason Thomas, a 50-year-old offshore worker from Newport, Wales, disappeared from the jack-up rig Valaris 121 while it was being towed 100 miles southeast of Aberdeen toward Dundee for maintenance. A deck grating outside a boot-room door was missing, leaving a void that dropped to the sea below. Thomas was last seen leaving a staff lounge with a coffee and his mobile phone; his hard hat, gloves and radio were later recovered near the airlock, but his body was never found. Aberdeen Sheriff Court fined Ensco Offshore UK Limited (EO UK Ltd) £267 000 plus a £20 025 victim surcharge, totalling £287 025, on 18 May 2026 for breaching the Health and Safety at Work Act.
Background and Safety Context
Valaris 121, a jack-up rig, was under tow in the North Sea when weather deteriorated, with winds above 30 mph and waves exceeding five metres. The missing grating was a polymer deck panel that, according to the Health and Safety Executive (HSE), had not been secured in line with the original equipment manufacturer’s specifications. Inspections failed to verify that the Hilti clips used to fasten the grating were correctly deployed. The operator had previously held an “excellent safety record” and no prior health-and-safety convictions.
Key Figures and Organizations
- Jason Thomas – experienced offshore worker, deck foreman and crane operator.
- Ensco Offshore UK Ltd (EO UK Ltd) – operator of Valaris 121.
- Health and Safety Executive (HSE) – investigative authority; principal inspector Steven Hanson Hall.
- Richard Brown – Crown prosecutor at Aberdeen Sheriff Court.
- Barry Smith KC – counsel for Ensco.
- Sheriff Morag McLaughlin – presiding judge.
- HM Coastguard – engaged in the search operation.
Investigation Findings and Data
The HSE concluded that an insufficient number of fastening clips allowed wave action to dislodge the grating. No evidence of malicious interference was found; examinations revealed no tool marks on the clips. Following the incident, Ensco replaced all polymer deck gratings across its fleet with galvanised steel alternatives. The fine comprised £267 000 for the health-and-safety breach and a £20 025 victim surcharge.
Official Statements & Responses
The Crown argued that the inadequate fastening and severe wave forces directly caused the grating failure. Ensco’s counsel expressed condolences, regret over the safety lapse, and affirmed that the company had learned from the incident. Sheriff McLaughlin acknowledged the operator’s strong safety record while describing the outcome as “very, very tragic.” HSE’s principal inspector highlighted the profound impact on Thomas’s colleagues and community, emphasizing that proper design, installation and maintenance of grating systems are essential, especially in harsh marine environments.
Criticism of Safety Practices
The investigation identified gaps in routine inspections, specifically the failure to confirm correct deployment of fastening clips. Delays in contacting HM Coastguard until shortly before 9 pm have also been noted as a procedural shortfall. Critics argue that simple risk-identification measures during rig moves could have prevented the fatality.
Verbatim Quotes
- “The fiscal depute said the Crown position was that the number of fastening clips had been insufficient, and wave action on the journey would have been sufficient force to cause them to fail.” — Richard Brown, Crown prosecutor
- “Grating systems must be designed, installed and maintained so that they do not present a risk to anyone that may use them, particularly when used in environments where they are susceptible to damage,” — Steven Hanson Hall, HSE principal inspector
- “Had the company taken relatively simple measures to identify and control the underling risks, particularly during the rig move, it is highly likely the incident would never have occurred, and Jason would have returned home.” — Steven Hanson Hall, HSE principal inspector
- “Lessons have been learned,” — Barry Smith KC, counsel for Ensco
- “The fact his body was never found resulted in great anguish to his mother, who has also since died.” — Steven Hanson Hall, HSE principal inspector
Conflicting Reports & Gaps
Thomas’s body was never recovered, and his mother later obtained a Presumed Death Certificate before her own death. While the HSE ruled out sabotage, the exact moment of the grating’s failure remains unobserved. The delayed involvement of HM Coastguard and the absence of tool marks on the clips leave procedural uncertainties.
What’s Next
Ensco has committed to replacing polymer deck gratings with galvanised steel across its fleet. HSE recommends enhanced inspection protocols and risk assessments for deck gratings during rig relocations, particularly under adverse sea conditions.
