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Deepsea Delta semi-submersible drilling rig in the North Sea Comparison of deepwater semi-submersible (left) and drillship (right). A semi-submersible platform is a specialised marine vessel used in offshore roles including as offshore drilling rigs, safety vessels, oil production platforms, and heavy lift cranes.
A drillship is a merchant vessel designed for use in exploratory offshore drilling of new oil and gas wells or for scientific drilling purposes. In recent years the vessels have been used in deepwater and ultra-deepwater applications, equipped with the latest and most advanced dynamic positioning systems.
Semi-submarine, which cannot fully submerge; Semi-submersible naval vessel, which partially submerges to minimize being observed; Semi-submersible platform, which is typically transported to a location where it is placed in service
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These include bottom founded drilling rigs (jackup barges and swamp barges), combined drilling and production facilities either bottom founded or floating platforms, and deepwater mobile offshore drilling units (MODU) including semi-submersibles or drillships. These are capable of operating in water depths up to 3,000 metres (9,800 ft).
A semi-submarine, taken out of the water. A semi-submarine (semi-sub) is a surface vessel that is not capable of diving, but has accommodation space below the waterline featuring underwater windows. [1] The watercraft is similar to glass-bottom boats, but with deeper draft. Both types of boats are mainly used to provide sight-seeing trips for ...
Semi-submersible Imperial Russian Navy torpedo boat, Keta The Imperial Russian Navy developed semi-submersible vessels—starting with the Keta [] —which were designed to be torpedo boats with low visibility for coastal protection against enemy warships.
Deepwater Nautilus is an ultra-deepwater, semi-submersible offshore drilling rig. Built in 2000 in South Korea , she is owned by Transocean , registered in Vanuatu , and currently leased to Petronas at the rate of $140,000 per day for drilling operations in Malaysia .