We have done some video surveys of the mooring lines and the export cable of the largest grid-connected Floating Wind Turbine in France. The Floatgen turbine, 2MW capacity, is being tested at the SEMREV offshore test site operated by Ecole Centrale de Nantes.
Although this was a very steep learning curve for us, we got some very nice results.
Although the wind (<5 knots) and waves (<1m) conditions were ideal, the lines and cables were still moving. It worked OK, however a video stream with less latency and a professional controller would definitely improve survey performance. Several solutions are already described in the forum, we just need to purchase/implement them before the next job !
Many thanks to BlueRobotics people for the product and support. Many thanks to the people on this forum.
Figure 1: Ready for diving (Credits: Ecole Centrale De Nantes)
Figure 2 : ROV approaching the hull and fairlead of a mooring line, look for some yellow ROV not blue! (Credits: Ecole Centrale De Nantes)
Figure 3: Underwater example but for the mooring line of a nearby special mark buoy.