For more than a century after science first named it, the colossal squid was known almost entirely from fragments: beaks recovered from the stomachs of whales, damaged bodies hauled up in fishing nets, and a handful of dying or dead specimens. No one had ever watched one swimming freely in its natural home, the cold black depths of the Southern Ocean. That gap was finally closed when a research team captured the first confirmed footage of a live colossal squid in the deep, a landmark moment for the study of one of the ocean’s most elusive giants.
An animal known mostly from its remains
The colossal squid was formally described in the early twentieth century, based on parts found inside a sperm whale. In the decades that followed, the picture built up piece by piece from indirect evidence, because the intact animal lives at depths and in a region that make direct observation extraordinarily hard.
According to reference material on the colossal squid, the species is believed to be the heaviest invertebrate on Earth, with mature adults potentially reaching a mass of several hundred kilograms. Much of what scientists inferred about its size and biology came from measuring beaks and body parts rather than from watching living animals behave.
The moment it was finally seen alive
The breakthrough footage came from a deep-sea expedition operating a remotely operated vehicle in the waters near the South Sandwich Islands, in the far South Atlantic reaches of the Southern Ocean. The vehicle’s cameras recorded a colossal squid drifting in the water column, hundreds of meters below the surface, going about its life undisturbed.
The individual caught on camera was not one of the legendary heavyweights but a juvenile, measuring only around 30 centimeters, roughly a foot long. Its body was largely transparent, a common trait among young deep-sea squid that helps them blend into the dim water. That a small, delicate juvenile was the first of its kind ever filmed alive underscored just how little direct observation the species had received, and how much remains unknown about how these animals grow from such fragile beginnings into ocean giants.
Why it took so long to find one
The difficulty of filming a live colossal squid comes down to where and how it lives. The species inhabits the deep waters around Antarctica, a remote and hostile environment that is expensive and logistically demanding to reach. The animals range through a vast volume of open ocean at depths where sunlight never penetrates, making the odds of a camera happening upon one very low.
There is also reason to think the squid actively avoids the very machines sent to look for it. Large research submersibles and remotely operated vehicles carry bright lights and generate noise, and a sensitive deep-sea animal may simply move away before it can be recorded. Earlier encounters had almost always involved specimens that were dead, dying, or brought to the surface by fishing gear, which revealed anatomy but nothing about natural behavior. Capturing a healthy, free-swimming individual in its own habitat required both improved technology and a measure of luck.
What its huge eyes and hooked arms reveal
The colossal squid is built for a life in near-total darkness. It possesses some of the largest eyes in the animal kingdom, an adaptation that gathers the faint light available in the deep and helps it detect the glow of bioluminescent prey or the looming shadow of a predator. Those enormous eyes are among its most striking features and a clear signal of how thoroughly it is tuned to its lightless world.
Its feeding apparatus is equally specialized. Unlike many squid, the colossal squid carries rotating hooks on its arms and tentacles, formidable tools for seizing and holding prey in an environment where meals are scarce and must not be lost once caught. Those same hooks leave distinctive scars on the bodies of sperm whales, which hunt the squid and bear the marks of the struggle. The animal is thought to be a relatively slow-moving ambush predator, hanging in the water and relying on stealth and its grasping weaponry rather than speed.
Why the footage matters for science
Seeing an animal alive in its habitat provides information that no preserved specimen can. The footage offers direct evidence of how the young squid holds itself in the water, how it moves, and how it responds to its surroundings, filling in behavioral details that had only been guessed at from anatomy. For a species this poorly understood, even a brief clip is a significant addition to the scientific record.
The achievement also highlights how much of the deep ocean remains unexplored. That an animal as large and famous as the colossal squid went unfilmed alive until so recently is a reminder that the deep sea is still, in practical terms, one of the least-observed environments on the planet. Each new expedition with capable cameras and vehicles has the potential to document creatures that have only ever been known from scraps. For researchers who study the biology of the far south, the first living glimpse of a colossal squid stands as both a milestone and an invitation to keep looking, because the depths clearly still hold sights no human has yet witnessed.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
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