Not V. .....that maritime law motif that flows thru IV....Oil Rig is an oceangoing VESSEL!....never, never, never, etc.

[Mark Kohut]

After a BP refinery in Texas exploded in 2005, killing 15 workers and injuring scores more, the oil giant paid $1.6 billion in settlements to employees and their families. But the families of the workers killed on BP's Deepwater Horizon rig in the Gulf of Mexico probably won't receive a similar windfall. That's because the Deepwater rig is legally considered an oceangoing vessel and was more three nautical miles offshore at the time of the accident. As a result, the families of the dead workers can only sue BP and its contractors under a 90-year-old maritime law, the Death on the High Seas Act, which severely limits liability. In some cases, BP could get away with shelling out sums as paltry as $1,000.
 
From a Slate article.