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Ok, if you are soloing, in some parts of this nice video you are filmed. The camera is pretty static. This means to me that you left it in the bottom filming. This also means that the camera should be pretty negative to be left there, affecting your buoyancy.
Besides, this is sea water, though it has the greenish colour of fresh water (where has gone the blue ?).
Thanks... The solo diving actually makes exploring weird sites a lot easier for me. I don't have to worry about boring someone on a lame dive and I have the freedom to go where and when I want.