Six hundred meters below the surface of the Southern Ocean, in near-freezing water off the South Sandwich Islands, a remotely operated submersible caught something on camera that no human had ever recorded before: a living colossal squid, drifting through its own habitat. The animal was a juvenile, roughly 30 centimeters long, but the significance of the footage is enormous. In the century since science first put a name to the species, every colossal squid studied had been dead or dying. This one was alive, moving, and behaving on its own terms.
The Schmidt Ocean Institute announced the sighting in April 2025, confirming that its research vessel Falkor (too) had captured the footage during an expedition to one of the most remote archipelagos in the South Atlantic. The video, recorded by the institute’s deep-diving ROV, represents the first verified film of a live Mesonychoteuthis hamiltoni, the species commonly known as the colossal squid and recognized as the largest invertebrate predator on Earth by mass.
A century between a name and a living animal
The colossal squid entered the scientific record in 1925, when British zoologist Guy Coburn Robson described the genus Mesonychoteuthis in the Annals and Magazine of Natural History. His material was sparse: two tentacle fragments pulled from the stomach of a sperm whale. From those pieces alone, Robson recognized something new, an animal distinct from the already-legendary giant squid (Architeuthis). But for the next hundred years, researchers never managed to observe a colossal squid alive in the deep ocean.
That is not for lack of interest. The colossal squid occupies a singular place in marine biology. Adults are believed to reach mantle lengths of around two meters, with total lengths potentially stretching to five or six meters. Their tentacles are lined with swiveling hooks, a feature unique among known squid species, built for gripping prey in the pitch-dark midwater zone. They are a major food source for sperm whales, whose stomachs have yielded most of the specimens scientists have examined. Yet nearly everything known about the animal’s behavior, from how it hunts to how it moves through the water column, has been inferred from carcasses, beak fragments, and the scars they leave on whale skin.
The new footage changes that. “Almost everything we know about this species comes from dead or dying animals,” said Kat Bolstad, a cephalopod researcher at Auckland University of Technology who has studied colossal squid biology for years. The video, she noted, offers the first direct look at how the animal actually behaves in its natural environment.
What the cameras captured
The juvenile was filmed at approximately 600 meters depth, in the cold, nutrient-dense waters surrounding the South Sandwich Islands. That archipelago sits between South America and Antarctica, in a stretch of ocean shaped by powerful currents and volcanic geology. The conditions there support a distinct deep-sea ecosystem, rich in the kind of prey that large cephalopods depend on.
The same expedition produced a second notable encounter. On January 25, the ROV recorded a glacial glass squid, another rarely observed deep-sea cephalopod, according to the Schmidt Ocean Institute’s statement. Both sightings came from the same research cruise, underscoring how much undocumented life persists in waters that few submersibles ever reach.
The exact date of the colossal squid encounter has not been specified in public reporting, and the Schmidt Ocean Institute has not yet released the full footage or detailed metadata. That means outside researchers have not been able to conduct frame-by-frame behavioral analysis. Bolstad’s comments suggest the video reveals natural movements not previously documented, but the specifics of what the juvenile was doing, whether it was feeding, fleeing, or simply hovering, have not been described in detail.
A juvenile raises new questions
The fact that the filmed animal was a juvenile, not an adult, opens a line of inquiry that barely existed before. At 30 centimeters, this squid was a fraction of its potential adult size. Its presence at 600 meters near the South Sandwich Islands raises the possibility that the region serves as a nursery ground, a place where young colossal squid spend their early lives before dispersing into the broader Southern Ocean.
That possibility had no observational basis until now. Scientists have long believed that colossal squid range across much of the Southern Ocean, but the species’ life cycle, including where juveniles develop and at what depths, has remained almost entirely unknown. A single sighting cannot confirm a nursery habitat, but it gives future expeditions a concrete starting point: a confirmed location, depth, and season where a young colossal squid was present and alive.
Environmental data from the filming site, including water temperature, salinity, oxygen levels, and current patterns, have not been released publicly as of June 2026. Those variables matter because they shape prey availability and influence how deep-sea predators distribute themselves vertically. Without that context, it is difficult to know whether this juvenile was occupying a typical depth for its age or had been pushed there by unusual conditions.
Why this is not the giant squid footage from 2005
Readers familiar with deep-sea discoveries may recall that a Japanese research team filmed a live giant squid (Architeuthis dux) in 2004, with the results published in 2005. That was a landmark moment in its own right, but the two species are distinct animals. Giant squid are longer but lighter, built for speed in the open water column. Colossal squid are heavier and more muscular, with those distinctive rotating tentacle hooks, adapted for a different predatory strategy in the deep Southern Ocean. Before the Schmidt Ocean Institute’s footage, the colossal squid had never been filmed alive in its habitat, making this a separate and long-awaited first.
What comes next for colossal squid research
The practical value of the footage lies in what it enables. Researchers now have a confirmed data point that can guide future cruise planning, encouraging teams to revisit the South Sandwich Islands at similar times of year and deploy cameras at comparable depths. It may also help refine distribution models, focusing attention on regions where cold, nutrient-rich currents intersect with suitable midwater habitat for juveniles.
But a single encounter, however historic, is a sample size of one. It cannot reveal population trends, migration routes, or the species’ overall health. Colossal squid play a significant role in Southern Ocean food webs, both as apex invertebrate predators and as prey for sperm whales. Connecting this sighting to larger ecological questions, including whether climate shifts are altering the species’ range, will require long-term monitoring, acoustic surveys, and many more visual encounters.
For now, the footage stands as something simpler and more profound: proof that an animal known for a hundred years only from fragments and carcasses is out there, intact and active, in the cold dark water where it belongs. The century-long gap between Robson’s two tentacle scraps and this living juvenile is finally closed. What opens next depends on whether anyone goes back to look again.
More from Morning Overview
*This article was researched with the help of AI, with human editors creating the final content.
