No I was watching through a tiny bit above the water line at the top of the "underwater window". Dirt on the window and balancing on a sloping window sill, holding on with one hand and trying to work the camera with the other made it a bit difficult but it wasn't dangerous. I just risked looking silly if I fell off!
Thanks It was a bit tricky and precarious! I had to balance on the sloping lower ledge of the underwater viewing window, hold on to the side with one hand and try to aim my camera steadily through the little gap of glass between the surface of the water and the top of the window.The glass was a bit dirty in places too. I was really pleased with the result though.