This BBC video says about itself:
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.
Reblogged this on Die Erste Eslarner Zeitung – Aus und über Eslarn, sowie die bayerisch-tschechische Region!.
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