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A directional, battery operated, waterproof light was attached to a 6 ft pvc pipe. I had a friend moving from spot to spot, sticking the light under water and illuminating each area. All in all, this photo is a combination of about 10 1.5 minute exposures. It took a good hour to shoot all of the frames (little bit of setup / lighting testing involved in each shot). Obviously, the camera was on a tripod the whole time and the different lit areas were combined in PS.