Underwater video - The MarineDetective
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In this video clip, you'll see that the nudibranch swims upwards but, when it wants to go down, it just stops moving and gently drifts back down to the ocean bottom. You'll also see that I am pointing my dive light at the animal and how this makes colours look different underwater.

giant nudbranchvideonorthern vancouver islandbritish columbiacanadasea slugnudibranch

From Sea slugs & sea slug egg masses / nudibranchs