Deepwater Horizon isn’t a ship.

https://en.wikipedia.org/wiki/Exxon_Valdez_oil_spill

But the effect is that oil companies just manage the logistics of the ships and don’t own/operate them themselves.

Ex. BP founded an entity to manage all the ships they were acquiring and later sold all the ships off to avoid liability.

https://en.wikipedia.org/wiki/BP_Shipping