A lot of stuff goes on during the operation of the many sophisticated vessels and rigs in the offshore business, one of them being helliops.  if you have a hundred or so people on your installation you will probably carry out sone sort of a crew change every day, and so must be prepared for the deck crew to have to put on their special gear and man the helideck while the helicopter lands, people get off and on and then leaves. If you are a long way from the beach the thing may need to be refuelled, in which case everybody has to get off. Here is a CHC helicopter on the helideck of the diving ship CSO Venturer back in 2005.  

Photo by Tim McLeod and posted here on 19th April 2018.

I am fascinated by these amazing craft, fitted with unfeasibly large Huisman towers so that they can lay flexible pipe on the seabed, this one in water depths up to 3000 metres I think. Offshore ships started off as sort of big tugs but now they can be like this ship, the fourth of a class built in Holland and registered in IOM. Its displacement is 27000 tons, and its total thruster power of 18,000 kW, and it can provide accommodation for 120 people.

I rediscovered this fine photo of the UT734 Star Spica today while looking for a means of illustrating North Sea weather. This ship and its sister ship the Star Sirius were the Shell contracted anchor-handlers in Aberdeen for some years starting in 1986. The two ships had been built in Norway in 1985, they were powered by two Wartsila diesels giving them 9000 bhp. After passing through several owners in UK they ended up in the Far East and may now have gone to the breakers. In the photo the Spica is actually towing a semi with the Sirius from which the photo was taken.

 
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