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 (sĕm′ē-səb-mûr′sə-bəl, sĕm′ī-)
1. Any of various self-propelled water vessels designed so that most, but not all, of the structure is submerged, including vessels with decks close to the waterline for transporting large structures such as oil rigs and disabled ships, and vessels with minimal structure above the waterline for avoiding detection.
2. A seagoing, self-propelled barge that has partially submerged vertical legs attached to underwater hulls or pontoons and serves as living quarters and a base of operations in offshore drilling. In this sense also called semisubmersible rig.

sem′i·sub·mer′si·ble adj.


1. (Mining & Quarrying) nautical (of an oil rig or watercraft) that can put much of its bulk under water
2. (Nautical Terms) nautical (of an oil rig or watercraft) that can put much of its bulk under water
3. (Nautical Terms) nautical a watercraft that can put much of its bulk under water
4. (Mining & Quarrying) mining a shortened form of semisubmersible rig


(ˌsɛm i səbˈmɜr sə bəl, ˌsɛm aɪ-)

1. Also called sem′isubmers′ible rig′. a self-propelled barge mounted on legs supported by underwater pontoons, on which offshore drilling crews live and work.
2. of or for a semisubmersible.
References in periodicals archive ?
The Heydar Aliyev semi-submersible drilling rig was dispatched on February 23, 2018 from the offshore supply and logistics base of the Caspian Drilling Company for drilling work in the Absheron field, the company said.
Adding around $20m to its backlog, offshore driller Ocean Rig has signed a new contract for one of its drillships and secured an extension for a semi-submersible rig.
Drilling contractor North Atlantic Drilling Ltd (NYSE:NADL) reported on Tuesday that it has amended its agreement with Jurong Shipyard Pte Ltd to extend the delivery deferral period of the semi-submersible West Rigel unit to 6 January 2017.
Olsen Energy settles dispute on construction of the semi-submersible drilling platform 'Bollsta Dolphin'
The semi-submersible vessel and its three crew members were taken into custody Thursday while trying to evade capture about 200 miles (320 kilometers) from the Galapagos Islands.
The Petrobras P-55 semi-submersible recently left the Rio Grande Shipyard (ERG-1) en route to the Roncador field in Brazil's Campos Basin.
North Korea has apparently redeployed semi-submersible vessels along its de facto maritime border with South Korea and is priming coastal artillery for a major military drill, a Seoul daily reported Monday.
Summary: Drydocks World recently held a keel laying ceremony for a state-of-the-art Compact Semi-Submersible (CSS) vessel.
Drydocks World began construction on a state-of-the-art Compact Semi-Submersible (CSS) vessel, as part of a $110 million contract.
International Resource News-20 July 2010-Xcite Energy signs binding contract for Ocean Nomad semi-submersible rig(C)2010 ENPublishing - http://www.
Iran plans to use its new Iran-Alborz semi-submersible drilling rig to drill and explore the Caspian Sea by Now Ruz, an official at Khazar Exploration and Production Co.
There is a bright prospect of finding reserves of crude oil in the region (by using Iran-Alborz semi-submersible rig) considering the high potential for Hydrocarbon reserves in the Caspian Sea," Mahmoud Zirakchianzadeh, a member of KEPCO's board of directors, told Iran's Shana news agency on Monday.