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Well, the name says it all. Back in 1973 when the Forties Field was being developed Jackson Marine put this small ship to work in the North Sea. By then the Europeans were building ships with funnels just aft of the accommodation, so as to limit the possibility of the engines being put out by big waves. The UT 704 was only two years away. But unusually this ship is still at sea disguised as the BB Lifter, fitted with a crane on the afterdeck. It is powered by two Cats developing 2500 bhp collectively which are connected to variable pitch props. Probably a later upgrade.
Here is the Pentagone semi-submersible Petrolia in the Cromarty Firth back in 2005. This rig type was constructed in large numbers back in the 1970s, mostly at shipyards in France. Internally they were very like the jack-ups of the same vintage with a central area containing the sack store the bulk tanks, a control space and a window overlooking the moonpool (Not likely to be allowed today). The five legs had a sort of bulbous space on the bottom. When the Alexander Kielland broke apart in the North Sea in 1980 (Full summary in my book "A Catalogue of Disasters") Norwegian rigs were required to remain afloat with one leg missing, and this rig had been modified to conform.
The Big Orange XVIII is another well stimulation vessel (the second featured this month) but this one actually purpose built in 1984. Why "orange" you might ask? This is because Schlumburger one of the providers of oilfield services, used to have a whole fleet of these craft, probably starting with Big Orange 1 which, back in the old days, tied up to platforms and did their stuff. The ship used dynamic positioning to hold station - oh, and they were painted orange. This fine vessel was involved in an interesting accident at Ekofisk in 2009. Buy my book - A Catalogue of Disasters - to find out more.