Colossal squid filmed alive for first time since its discovery a century ago
The rare footage was captured on March 9 by Schmidt Ocean Institute's remotely operated vehicle SuBastian, at a depth of 600 metres off the South Sandwich Islands in the Atlantic Ocean.
The juvenile squid, around 30 centimetres long, is the first confirmed sighting of a living Mesonychoteuthis hamiltoni in its natural habitat.
Colossal squid are thought to grow up to seven metres and weigh as much as 500kg, making them the world's heaviest invertebrate.
Until now they have been seen only dead – washed up or in the stomachs of predators such as whales.
'It's exciting to see the first in situ footage of a juvenile colossal and humbling to think that they have no idea that humans exist,' said Dr Kat Bolstad, who helped verify the footage.
The discovery came during a 35-day ocean census expedition – part of a global project to find and record new marine life.
The mission involved Schmidt Ocean Institute, the Nippon Foundation–Nekton Ocean Census, and research teams from the UK and Germany.
Experts confirmed the juvenile squid by its transparent body and arm hooks, which help distinguish it from similar species such as the glacial glass squid (Galiteuthis glacialis).
The glacial glass squid was also filmed alive for the first time on a previous Schmidt Ocean Institute expedition in January, in the Bellingshausen Sea off Antarctica.
'The first sighting of two different squids on back-to-back expeditions is remarkable,' said the Institute's executive director, Dr Jyotika Virmani.
'It shows how little we've seen of life in the Southern Ocean.'
To date, the Institute's ROV SuBastian has recorded the first confirmed footage of at least four deep-sea squid species, with another still awaiting identification.
'These unforgettable moments remind us how much of the ocean remains unexplored,' Dr Virmani added.
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