Vessel or Platform: The Classification That Decides Everything
Drillships, semi-submersibles, and jack-ups are vessels
Mobile offshore drilling units — drillships, semi-submersibles, jack-up rigs, liftboats — are generally vessels in navigation under maritime law, even when a jack-up has its legs down on location. If you have a substantial connection to one, in both the duration and the nature of your work, you are likely a Jones Act seaman. That status carries three separate rights: a negligence claim against your employer under the Jones Act, 46 U.S.C. § 30104, where you only have to show the company’s carelessness played any part, however slight, in your injury; an unseaworthiness claim against the vessel owner if the rig, its gear, or its crew was not reasonably fit; and maintenance and cure — daily living money and medical care, owed no matter who was at fault.
Fixed platforms are artificial islands
A production platform bolted to the seafloor is not a vessel. Under the Outer Continental Shelf Lands Act, 43 U.S.C. § 1333, it is treated as an artificial island, and the law of the adjacent state — Texas or Louisiana, usually — fills the gaps in federal law. Platform workers are not Jones Act seamen. Their wage and medical benefits typically come through the Longshore and Harbor Workers’ Compensation Act, and their injury case is a negligence claim against the third parties who caused the harm: the operator, the contractors, the company that serviced the crane or wrote the permit.
The gray zone is where cases are won and lost
Offshore work refuses to stay in one box. A platform worker rides vessels to the job. A rig hand splits time across a fleet. A jack-up gets towed between locations. Employers exploit that ambiguity: if the company can recast a seaman as a platform contractor, your rights shrink dramatically. Classification is usually the first fight, and it is fought with time sheets, crew manifests, and job assignments — records the company already has. Our sibling page on worker classification covers that fight in detail.
| What it changes | Vessel (Jones Act seaman) | Fixed platform (OCSLA) |
|---|---|---|
| Who answers for it | Your employer and the vessel owner | Negligent third parties: operator, contractors |
| What you must prove | Negligence played any part, however slight; or an unseaworthy condition | Ordinary negligence under adjacent state law |
| While you heal | Maintenance and cure, regardless of fault | Longshore Act wage and medical benefits |
How We Prove an Offshore Case
Offshore companies document everything, and those documents rarely favor the worker who got hurt — until you read them closely. We move immediately to lock down the daily drilling reports, the IADC sheets, the job safety analysis and permit-to-work for the task that hurt you, the maintenance history on the drawworks, top drive, or crane involved, the safety management system, the personnel-basket transfer logs, the weather stand-down emails, and the traffic between the operator’s company man and the contractor. We dig until the other side’s own documents tell the story.
This is also the practice where we represented Captain Wren Thomas, master of the offshore supply vessel C-Retriever, after he was kidnapped by pirates off Nigeria and held for weeks in the Niger Delta — a case we brought against Edison Chouest Offshore and Chevron after his safety warnings were ignored. When the offshore industry cuts corners, we have been in the room where it answers for it.
