A pair of scuba divers have captured amazing footage of marine life by leaving their GoPro on the ocean floor unmanned. Brittany Ziegler, 34, from Maui, Hawaii, and her best friend Bettina Aelley, 38, have been live-streaming their dives on social media for two years. The pair started experimenting with leaving a camera on the ocean floor a year ago and have been able to capture how marine animals behave when no humans are around. They have captured amazing footage of sea turtles, sharks, stingrays, and the sounds of whales.