GSF Development Driller II

GSF Development Driller II is a fifth generation, Vanuatu-flagged dynamic positioning semi-submersible ultra-deepwater drilling rig owned and operated by Transocean. The vessel is capable of drilling in water depths up to with drilling depth of , upgradeable to .
"Development Driller II" was deployed in drilling a relief well on the Macondo Prospect to stop the oil spill caused by the explosion and subsequent loss of "Deepwater Horizon".