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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).
Blackford Dolphin Blackford Dolphin at Botlek harbour, Rotterdam, The Netherlands 08 March 2007.
Blackford Dolphin Blackford Dolphin at Botlek harbour, Rotterdam, The Netherlands 08 March 2007.
Blackford Dolphin Blackford Dolphin at Botlek harbour, Rotterdam, The Netherlands 08 March 2007.
Noble Rig Noble at Botlek harbour, Rotterdam, The Netherlands 03 June 2007.
Noble driller Noble rig at Botlek harbour, Rotterdam, The Netherlands 03 June 2007.
Transocean Prospect Transocean Prospect by night, Botlek harbour, Port of Rotterdam, The Netherlands 24 January 2006.
Transocean Prospect Transocean Prospect, Botlek harbour, Port of Rotterdam, The Netherlands 09 January 2006.
Transocean Prospect Transocean Prospect, Botlek harbour, Port of Rotterdam, The Netherlands 17 Apr 2006.
Transocean Prospect closeup Transocean Prospect, Botlek harbour, Port of Rotterdam, The Netherlands 17 Apr 2006.
Transocean Prospect Transocean Prospect, waiting for shipping, Port of Rotterdam, The Netherlands 04 Jul 2006.
Transocean Prospect Transocean Prospect by night, Port of Rotterdam, The Netherlands 08Jul2006.
Noble Juile Roberston The Noble Juile Roberston, from the wireline winch.

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