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However, the intense pulses of light that accompanied the ferocious attacks surprised the research team.
The footage reveals the creatures emitting short flashes from light-producing organs, called photophores, on their arms.
The light would disorientate the squid's intended prey, disrupting their defences, they added.
The films, taken at depths of 240m to 940m (790 to 3,080ft), also show the cephalopods reaching speeds of up to 2.5m (8ft) per second as they attack the bait, capturing it with their eight tentacles.