offshore oil platforms might cause oil to leak into the water
offshore_oil_platform is not offshore_drilling_rig. offshore_oil_platform is offshore_drilling_rig. deep_water_oil_drilling is not offshore_oil_drilling. offshore_oil_drilling is removal_by_moving. offshore_oil_platform is platform. offshore_oil_drilling is not removal_by_moving. offshore_oil_platform is not platform. offshore_oil_platform is fixed_structure_platform. deep_water_oil_drilling is offshore_oil_drilling. offshore_oil_platform is not fixed_structure_platform.