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Drilling Rigs - Semi-Submersible

A Semi-submersible platform or rig, is a mobile structure used for drilling for oil and natural gas in offshore environments. Their superstructures are supported by columns sitting on hulls or pontoons which are ballasted below the water surface. They provide excellent stability in rough, deep seas. Semi-submersible rigs can be moved from place to place; and can be ballasted up or down by altering the amount of flooding in buoyancy tanks; they are generally anchored by cable anchors during drilling operations, though they can also be kept in place by dynamic positioning. Semi-submersibles can be used in depths from 600 up to 35,000 feet (180 to more than 10,600 m).
Ross Isle Ross Isle at CCB (Coast Center Base), Aagotnes, April 1. 1994
Deepsea Atlantic Deepsea Atlantic,at Hanoytangen, Askoy (NW) of Bergen, August 31.2010 IMO:8769042
Deepsea Atlantic - Drilling rig Deepsea Atlantic,at Hanoytangen, Askoy (NW) of Bergen, August 31.2010 IMO:8769042
Deepsea Atlantic - Drilling rig Deepsea Atlantic,at Hanoytangen, Askoy (NW) of Bergen, August 31.2010 IMO:8769042
The hull of the OBAN B BHS flagged OBAN B (a MOSS CS50 MKII) seen here offshore Rotterdam 29-03-2009.
DEEPSEA DELTA - Drilling rig DEEPSEA DELTA, imo:8756590/1981, test equipment and miscellaneous Hjeltefjorden, October 22 2008 ass...
WEST PHOENIX - Drilling rig WEST PHOENIX, imo:8768294/2008, seen at CCB (Coast Center Base) Aagotnes, October 22. 2008
WEST PHOENIX - Drilling rig WEST PHOENIX, imo:8768294/2008, seen at CCB (Coast Center Base) Aagotnes, October 22. 2008.
WEST PHOENIX - Drilling rig WEST PHOENIX, imo:8768294/2008, seen at CCB (Coast Center Base) Aagotnes, October 22. 2008
BORGLAND DOLPHIN - Drilling rig BORGLAND DOLPHIN, imo:8758469/1977. Builder Harland & Wolff (Conversion), Belfast, Ireland: Major up...
Borgland Dolphin & Havila Mars Borgland Dolphin, imo:8758469/1977. Builder Harland & Wolff (Conversion), Belfast, Ireland: Major up...

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