Pierre, the set-up is the Oly 5050z and PT015 housing. No strobes other than the internal one - the close ups use the strobe and the scenics / blue water ones are juswt available light.
All with a little colour correction in PS.
The wheel required a little more manipulation - create a copy of the background layer - apply a layer mask and paint into the layer mask around the wheel to reveal the colours of the original layer - easy.
As a beginner I have to say that digital rocks - I could just keep shooting, easily adjust colours on the pc afterwards and, if I didn't get a shot I liked, then go down again and shoot some more.
Good thing about the C5050 is that it captures in a range of file formats including raw - so I don't have to worry about white balance etc - I just do that in the RAW file converter - excellent! The Nudi was taken in raw so I can still play around with the image and try and get the piccy to be better.