No ray of sunlight reaches ocean depths of 1,000 metres and below. Being black, red, or transparent, like the Antarctic krill featured here, helps residents of the deep remain practically invisible and avoid predators.
Surviving at such depths means living under huge pressure - and not just because food is scarce: at around 8,400 metres below the sea, pressure is nearly 800 times greater than at the surface.
National Geographic's Gallery 'Translucent Creatures'
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