The First Confirmed Footage Was Not the Monster People Expected

For a century, the colossal squid occupied an unusual place between science and legend. Researchers knew the animal was real. Its remains appeared in predator stomachs, fishing vessels occasionally brought damaged specimens to the surface, and museum collections preserved bodies heavy enough to prove that enormous squid lived in the Southern Ocean.

But scientists had never confirmed footage of a living colossal squid swimming in its natural deep-sea habitat.

Then, in March 2025, a remotely operated vehicle (ROV) recorded one near the South Sandwich Islands.

The squid entered the camera beam around 600 metres below the surface. It was translucent, delicate, and measured roughly 30 centimetres. The first confirmed deep-sea footage of the heaviest known invertebrate captured a juvenile.

That detail made the sighting more interesting, not less.

A Baby Carrying the Blueprint of a Giant

The animal is called Mesonychoteuthis hamiltoni.

Adults can become massive. The largest well-known specimens have reached hundreds of kilograms, and mature animals may exceed 500 kilograms, making it widely described as the heaviest known invertebrate.

The juvenile recorded in 2025 looked nothing like the dark, battle-scarred kraken people imagine:

• Its body was almost completely transparent.
• The internal structures remained visible through the tissue.
• Small hooks helped researchers confirm the identification.

The footage revealed a beginning rather than an ending. Somewhere in the cold Southern Ocean, similar animals grow from glass-like juveniles into deep-sea giants carrying enormous eyes, powerful beaks, and rotating hooks.

Scientists have evidence for adult anatomy. What they still lack is a confirmed encounter with a healthy mature animal moving naturally at depth.

Why the Footage Mattered

The colossal squid was formally described in 1925 from material found inside a sperm whale. That origin shaped the mystery: the animal entered science indirectly, through the body of a predator capable of hunting it.

Over the following decades, additional evidence appeared through stomach contents and rare captures. A famous individual displayed at Te Papa in New Zealand weighs 495 kilograms.

However, surface specimens create limitations. An animal hauled from deep water may be damaged, stressed, or dying. Its shape changes outside its normal environment, and its behavior disappears.

A living squid at depth offers a different kind of evidence:

• Natural posture and movement
• In-situ transparency
• Real-time response to artificial light
• The exact positioning of the arms
• How a juvenile occupies the water column

Even a short observation can answer questions that preserved specimens cannot.

A Carefully Confirmed Identity

Deep-sea footage is not automatically proof. The ocean contains multiple squid species with overlapping features, especially among juveniles. Scientists need to examine body shape, appendages, hooks, and other anatomical clues before attaching a name.

Experts reviewed the footage and confirmed that the animal was a colossal squid. The hooks were especially important.

Colossal squid carry distinctive hooks on their arms and tentacles. Some can swivel, giving the animal a gripping system unlike the simple suction-cup image many people associate with squid.

The juvenile did not look dangerous in the cinematic sense; it looked fragile. That contrast is one of the strongest parts of the story. The anatomy of a future giant was already present inside an almost transparent body drifting through cold water.

Not the Same as a Giant Squid

The colossal squid is often confused with the giant squid. Both are real, live deep in the ocean, and have fueled human fascination—but they are not the same animal.

• The Giant Squid (Architeuthis): Famous for extraordinary total length, driven largely by its incredibly long feeding tentacles.
• The Colossal Squid (Mesonychoteuthis): Generally heavier and more robust. Its body is broader, its arms and tentacles carry hooks, and it is restricted to the Southern Ocean waters around Antarctica.

The difference matters because popular sea-monster stories often blend every large squid into one generic kraken. The real animals are more interesting when their distinctions remain visible.

The Eye Problem

Adult colossal squid have enormous eyes. Te Papa has documented eye dimensions reaching roughly the size of a soccer ball, providing some of the largest animal eyes ever measured.

Why evolve such massive eyes?

One leading idea is detection. In the deep ocean, light is scarce, but large eyes can collect more of it. They may help reveal movement, silhouettes, or bioluminescent disturbance in dark water, potentially helping them detect large approaching predators like sperm whales.

While many details of colossal-squid vision remain under study, the visual result is undeniable. An adult animal carries eyes large enough to transform the way it experiences the darkness.

Why Adults Remain Elusive

The Southern Ocean is a difficult place to work. The water is cold, weather can be severe, and depth creates extreme pressure and darkness. Expeditions cover limited routes across an enormous three-dimensional habitat.

A large squid may also detect approaching equipment long before cameras come close enough to record useful footage. Artificial light, noise, and movement can change or completely deter an encounter.

Researchers do not need a conspiracy to explain the absence of adult video. The environment itself is enough. Humans sample narrow corridors while the squid lives in a vast world. The first confirmed juvenile footage appeared through a fortunate intersection of animal, vehicle, timing, and expertise.

Key Takeaways

• The Sighting: In March 2025, researchers captured the first confirmed footage of a living colossal squid in its natural habitat near the South Sandwich Islands.
• The Specimen: The recorded individual was a 30-centimetre juvenile, remarkably translucent and fragile compared to adults.
• The Adult Scale: Mature individuals can exceed 500 kilograms, carry soccer-ball-sized eyes, and utilize swiveling hooks instead of standard suction cups.
• The Relationship: Sperm whales remain the primary source of adult remains, showcasing an intense predator-prey dynamic hidden in the deep ocean.

A Milestone, Not a Final Answer

The 2025 footage was important because it closed a major historical gap, but the observation opened far more questions for future marine biology:

• How do juveniles develop and when do they lose their transparent appearance?
• How quickly do they grow and where do mature animals concentrate?
• How exactly do adults hunt and use their hooks in natural conditions?
• What does a healthy adult look like before surface conditions change its body?

A giant adult would have produced an obvious viral moment, but the juvenile offers something more suspenseful. It is a promise. The camera caught a small translucent animal carrying hooks and the genetic blueprint for extreme size before it drifted back into the darkness.

Somewhere beyond the camera light, the Southern Ocean still contains mature colossal squid almost nobody has ever seen behaving naturally.

References:

• https://schmidtocean.org/first-colossal-squid-footage/
• https://tepapa.govt.nz/te-papa-celebrates-colossal-squid-s-100th-birthday