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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).
High Seas Driller Stormy weather whilst on High Seas Driller
Glomar Baltic 1 Dawn on the Glomar Baltic 1 {Thanks for the pics Andy - please email me as I'd like more info.}
Rigs in Beryl Field Production platform and Odeco drilling rig taken from High Seas Driller
Maesrk Highlander in Beryl Field Maersk Highlander semi-submersible drilling rig being towed to new well location in Beryl Field take...
Sedco 706 Calum says "The Secdo rig 706, looking strangely truncated with her top works removed is loaded onto...
Unknown Semi My father took this one in the 70's but Im not sure which one it is?
Dockwise Blue Marlin carrying Kan Tan IV Dockwise Blue Marlin with Semi-Sub Kan Tan IV
Sea Explorer-Now Ocean Guardian Taken during her construction on the Clyde
Deepsea Delta Deepsea Delta is a modified Ocean Ranger design third generation semi-submersible drilling rig built...
High Seas Driller Before it was painted red.

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