USA: Watch Blue Planet II on BBC America - 9pm Saturdays from 20th January 2018. To film Mobula rays at night, the Blue Planet II team use a special camera that allows then to see in almost complete darkness. Subscribe to BBC Earth - http://bit.ly/BBCEarthSub *Filming Hundreds Of Mobula Rays At Night - Blue Planet II Behind The Scenes* The Blue Planet II underwater camera crew use new camera technology to film hundreds of Mobula rays in almost complete darkness. As the rays glide through the dark water, their movement causes plankton to glow which is picked up my the camera. Check out the full Blue Planet II playlist here https://www.youtube.com/playlist?list... Planet Earth http://bit.ly/PlanetEarthPlaylist Blue Planet http://bit.ly/BluePlanetPlaylist Planet Earth II http://bit.ly/PlanetEarthIIPlaylist Planet Dinosaur http://bit.ly/PlanetDinoPlaylist Check out the other two channels in the BBC Earth network: BBC Earth Unplugged: http://bit.ly/BBCEarthUnplugged BBC Earth Lab: http://bit.ly/BBCEarthLabYouTubeChannel About BBC Earth The world is an amazing place full of stories, beauty and natural wonder. Jump in to BBC Earth's YouTube channel and meet your planet. You'll find 50 years worth of astounding, entertaining, thought-provoking and educational natural history content on here. Dramatic, rare, and exclusive, nature doesn't get more exciting than this. Subscribe to be the first to view new videos. And you can become part of the BBC community by checking out our BBC Earth Facebook page. Here you'll find the best natural history content from the web, exclusive videos and images and a thriving, vibrant community. Service information and feedback: http://bbcworldwide.com/vod-feedback--contact-detailx This is a commercial channel from BBC Studios. Service & Feedback https://www.bbcstudios.com/contact/contact-us/