Well thank you Papa, I will assume it is the game and not me then. I guess the underwater shots I have seen of other people's SH3 games might have been in taken in clearer water. I have never seen my boot under water as it is too 'black' to find it, though I can see underneath just fine in the game Dangerous Waters.
The sky in the day time is fine too, if the weather is good - fluffy white clouds and blue sky, but at night - not so good. but I can live with it!