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A Periphylla periphylla, or deep-sea helmet jellyfish, pictured colliding with the seafloor after it was startled by the bright lights from the submersible.
These jellyfish undertake a daily migration towards the surface at dusks, and back down towards the depths at dusk. The scientists suspect the creature was reacting to the bright lights on the submersible and attempted to swim down away from the light it thought was coming from the surface.