Thanks so much. It was shot on GoPro with a dom. It's a glass half circle that attaches to the GoPro to separate the water about 6 inches from the dome. This way you can shoot over the water and under the water thanks to the separation. And the two people in the water (me and my friend) just have to time their run. You shoot the GoPro in burst mode so it gets a good chance to catch the moment when the water is exactly 50/50. It takes 30 photos per second once you click the trigger so you can't miss it!