Profile: Ensco is a provider of offshore drilling services to the petroleum industry. Our semisubmersible rigs are floating offshore drilling units with pontoons and columns that when sea water is permitted to enter, cause the units to be partially submerged to a predetermined depth. Our Ensco 7500 is capable of drilling in water depths up to 8,000 feet and is a dynamically positioned rig, that also can be adapted for moored operations.