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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. Keta was built in 1904 in St. Petersburg , powered by a 14-horsepower (10 kW) motor, displacing 8 tons, and with a length of 7 metres (23 ft).
Semi-submersible may refer to a self-propelled vessel, such as: Heavy-lift ship, which partially submerge to allow their cargo (another ship) to float into place for transport; Narco-submarine, some of which remained partially on the surface; Semi-submarine, which cannot fully submerge
A heavy-lift ship is a vessel designed to move very large loads that cannot be transported by normal ships. They are of two types: Semi-submersible ships that take on water ballast to allow the load—usually another vessel—to be floated over the deck, whereupon the ballast is jettisoned and the ship's deck and cargo raised above the ...
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.
SSCV Sleipnir is a semi-submersible crane vessel (SSCV) owned and operated by the Netherlands-based Heerema Marine Contractors. It was ordered in 2015 and built in Singapore by Sembcorp Marine. It was named for Sleipnir, the eight-legged horse ridden by Odin in Norse mythology.
BOKA Vanguard (formerly Dockwise Vanguard) is a semisubmersible heavy-lift ship owned and operated by Dockwise B.V. Dockwise Vanguard is the largest vessel of her type ever built, and is able to carry cargoes up to 110,000 tonnes. [11]
A narco-submarine (also called a drug sub or narco-sub) is a type of custom ocean-going, self-propelled, semi-submersible or fully-submersible vessel built by (or for) drug smugglers. [2] [3] [4] Newer semi-submersibles are "nearly-fully" submersible in order to reduce likelihood of detection by visual, radar, sonar, or infrared systems. [3]
Blue Marlin and her sister ship MV Black Marlin compose the Marlin class of semisubmersible heavy-lift ships operated by Dockwise Shipping of the Netherlands. Designed to transport very large, semisubmersible drilling rigs above the transport ship's deck, she is equipped with 38 cabins to accommodate 60 people, a workout room, sauna and swimming facilities, and a secure citadel for protection ...