Drillships are marine vessels with dual derrick cranes used for exploratory well drilling in remote ultra-deepwater locations beyond the reach of platform and jackup rigs, typically in over 5,000 feet of water. Rather than having legs that rest on the seafloor, offshore drilling rigs remain floating at the drill site kept in position using onboard propulsion and dynamic positioning systems. Drillships offer the advantages of mobility and ability to operate independently in offshore areas away from ports or pipelines.

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