Something a little different. I don't get to see this shade of blue very often here due to the diving conditions, the shallow depths here and the clear water....but every so often on a deeper wreck on a cloudy day I look up and see the perfect shade of blue.
Aside from all the marine life and the flight of neutral buoyancy this shade of blue is just another joy of breathing compressed air underwater. Scientifically its just white light stripped of the redder frequencies by metres of water. To me though its the colour of the walls at my favourite venue. That's not a cross or memorial by the way - its just the top of an old fishing boat sunk specially for us divers.