Sparkly bits
The Sea & Sea submersible camera I was using even had a little macro adapter, which was cleverly designed but
a little challenging.
Also:
Even with ISO400 film, the camera had a very shallow depth of field;
I was positively buoyant and therefore sitting absolutely still was tricky;
I was surrounded by muck that kept getting in the way;
I was doing this underwater, with a mask on;
I was a little unnerved!
So if the images ain't quite perfect, I request your tolerance!