Underwater art
Now this is utterly fascinating. The artist Jason de Caires Taylor has made several sculptures and instalments intended to be seen while diving.
I think this circle of statues is my favourite. There is something mysterious and almost fairytale like about it. The artists says he wants his art to highlight ecology, as well as the relationship between the modern world and the environment. For more pictures check out his web site here, where is also where I got the pictures from.