To film Mobula rays at night, the Blue Planet II team use a special camera that allows then to see in almost complete darkness.
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*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.
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