This is a fairly new arrival from the Vard yard in Brazil, well, claimed by my other website to have entered service in 2014. But a typical modern anchor-handler of considerable size, but acceptable horsepower and bollard pull when it comes to moving oil rigs and anchoring FPSOs. Here we should remember that big is not always beautiful. If you have 30,000 bhp available the design of the craft has to be pretty well thought out so that it does not use too much fuel when not doing anything important.
Once more trawling through my archive, if only to avoid repeated photographs from Brazil, here is the Bourbon Petrel on its way, as a brand new ship, through the Bosphorus. It is one a a pretty new breed of offshore vessel, the seismic support ship. As seismic ships have developed becoming larger, and capable of deploying large numbers of streamers occupying a wide area of sea, they have become more and more reluctant to reel them in. Hence the support ship, which can carry stores, refuel the mother ship, transfer personnel, even tow if necessary and importantly scare other ships away. There are a few about now, but there is no indication about how busy they are.
Here is a multi-unit photograph from 2004. It is the Black Marlin heavy lift ship with the Maersk Guardian on the deck, and alongside the both of them is the Maersk Helper I think sending some-one up to the rig, on the basket. So the crane on the rig on the ship is being used. It is curious that often oil rigs on board heavy lift ships have many people on them, usually carrying out repairs ready for the next job. Although I worked in the business for many years I still have no idea how this squares up with the regulations.