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She also calculated the light levels in the squid’s mid-water habitat and, again, calculated the amount of light travelling sideways and downwards. “I remember sitting in my office comparing the two, and my jaw dropped,” says Sweeney.

They’d be impossible to see in the darkness of the open ocean were it not for their eyes—the only obviously opaque parts of their bodies.

These animals live between 2 metres below the ocean surface, where water is mostly dark.

Still, some sunlight penetrates to these depths, and this light is hundreds of times brighter than anything reflected horizontally or upwards.