An OilRig is a large platform in the sea, normally anchored to the sea bed which is then used to extract oil.
OilRigs get a lot of bad press. Oil is, of course, one of the main FossilFuels, which are NonRenewable. However, I think that the technological advances from the construction of OilRigs could be used for to great effect for the exploitation of OffShore generation technologies such as OffShoreWaveGenerators, OffShoreWindFarms, or HydrogenMining stations.