Hello! I am pleased to answer your question! The first, second and fourth shots were taken during the daytime without using additional light sources on the Canon 5D Mark II camera in the aquabox. The third shot was taken on the same camera, but at night using an underwater flash. And the fifth shot was taken on a Nikon D3s camera, while I highlighted the jellyfish with a powerful underwater lamp while exposing the entire frame. Thus, I achieved a short exposure under water during a long exposure of the whole picture.