French Divers Photograph a Coelacanth in Indonesian Waters

Night has already engulfed the bay as the French diver turns off his torch. For one second, there is nothing but black water and the sound of his breathing. Then two glassy eyes emerge from the darkness, surrounded by blue scales gleaming like old coins at the bottom of a chest. He goes still, his heart pounding beneath the wetsuit. Suspended in the glow of a red light, an animal looks back at him that, by any sensible measure, should no longer exist. It has the outline of something from a dinosaur book: a creature scientists once believed had disappeared alongside the T. rex.

With shaking fingers, he takes the photograph.

His dive computer shows a depth of 115 metres. On the camera display, it feels as though time itself is staring back.

The night a “living fossil” met a French camera

The creature is a coelacanth: the fish that forced a rewrite of 20th-century textbooks. Its fossil ancestors stretch back more than 400 million years, predating humans, mammals and even flowering plants. Yet, in the Indonesian deep at night, one drifts slowly past French divers like a weary dragon checking on visitors.

For days, the team had prepared in a small harbour in North Sulawesi. Cylinders stood beneath palm trees, cables lay curled like sea snakes, and quiet jokes circulated about “dinosaurs at depth”. Nobody truly expected an encounter. But at such depths, where every colour turns blue and silence seems to vibrate, hope becomes unexpectedly persistent.

The first encounter happens after almost an hour of descent. With stress fogging the edges of his mask, the French underwater photographer spots a stocky form moving clumsily along the rock face. It is not sleek like a shark; it is more like a sleepy Labrador attempting to climb stairs.

He lifts his camera and begins framing the image in his head. At that moment, the coelacanth turns in a slow, almost stage-managed arc. Its heavy lobed fins open like aged leather parasols. The fish does not bolt. Instead, it remains in place with its mouth slightly open and pale markings shining in the weak light. One photograph, then two, then three. A lifetime spent reading about this species suddenly narrows to one moment: here you are. Here I am.

Scientists had believed coelacanths had inhabited Indonesian waters since the late 1990s, but photographs captured by recreational divers were still absent. The species is famously elusive, sheltering in deep, cold caves by day and feeding only after dark. When the French team finally surfaced, cold, cramped and holding memory cards rather than trophies, they had brought back something exceptional: evidence that this prehistoric-looking neighbour still moves along the reefs’ abyssal fringe.

The ocean keeps secrets because most of us rarely bother to ask the right questions at the right depth.

Those grainy images, marked by backscatter and unsteady hands, are already being shared among marine biologists around the world.

How do you even photograph a fish that lives like a ghost?

Reaching a coelacanth means abandoning everything reassuring about an ordinary dive. There are no vivid coral gardens, curious turtles gliding by or gentle 20-metre depths. The French divers organised a trimix descent, using a carefully balanced mixture of helium, nitrogen and oxygen to keep their minds clear and bodies protected beyond 100 metres.

Every stage had been practised ashore: who would lead, who would provide light and who would monitor the time. One diver handled navigation, another operated the camera and a third managed safety. At those depths, improvising is not courageous; it is Russian roulette.

For the final approach, the team replaced standard white beams with gentler red lights. Powerful white light may alarm deep-sea creatures or, worse, prompt them to collide blindly with rocks. Red wavelengths are almost invisible to them, allowing the divers to behave less like intruders and more like quiet guests entering a dark theatre after the performance has begun.

They reduced their movements to an almost ridiculous slowness. There were no sudden fin strokes and no roaring curtain of bubbles rising overhead, only controlled breaths and minute adjustments. You can almost imagine the phrase running through their minds: “Don’t scare the fossil. Don’t scare the fossil.”

An expedition like this is not a casual Sunday trip from a hotel beach. At 100 metres, the room for error is vanishingly small. A flooded mask, jammed inflator or missed stage on the decompression schedule can rapidly become a catastrophe. Honestly, this is not something anyone does every day.

For that reason, the French divers depended on Indonesian guides who understood the shape of the reef better than any GPS. For years, these guides had heard stories of unusual large fish seen by deep-water fishers, with shadows passing their lines near submerged cliffs. This kind of spoken knowledge often reaches science decades before formal evidence does.

By combining modern technical-diving equipment with these understated accounts, the team eventually pieced together a route to the coelacanth’s refuge.

Between awe and responsibility: what this “dinosaur fish” asks of us

Once the images appeared on screens ashore, the immediate response was simple amazement. Look at that unusual head. Look at those limb-like fins, which resemble an early design for legs. Soon, however, a more troubling question follows: now that we know they are there, what responsibility do we have towards them?

For the French team, the first principle was direct and non-negotiable: do not touch, chase or trap the animal for a better image. One accurate and respectful meeting matters more than a hundred forceful ones. They restricted the time spent near the cave, captured only a small number of photographs and then began the long, cold ascent towards the surface.

Many divers quietly hope for a “unique” photograph like this. That ambition can result in familiar errors: diving beyond your training, disregarding local guidance or forcing your body past safe limits because the animal of a lifetime could be a little deeper still. The French crew speak frankly about the fear mixed in with their excitement. They also acknowledge the guilt they would have felt had their presence harmed or distressed the coelacanth.

We all recognise that instant when the desire for an image or a story edges too close to recklessness. The boundary is narrow, particularly when social media rewards spectacular captures first and asks about their consequences afterwards.

“Seeing a coelacanth feels like opening a door straight into deep time,” one of the divers told me afterward. “But as soon as the excitement faded, I felt a weight: we had been allowed into its living room. Now we have to talk about how not to turn it into a circus.”

• Limit deep tourism: These depths should only be approached by highly trained technical divers, always accompanied by local professionals familiar with the site.
• Respect the animal’s space: Do not use a barrage of flashes, block its route out of caves or use bait to draw it closer for photographs.
• Share the story, not the coordinates: Publicising the encounter has value, but withholding exact locations shields the species from uncontrolled visitor numbers.

A fish older than our myths, swimming into our present

“Coelacanth” is a word that almost sounds magical. However, the animal itself is simply a fish trying to survive another dark, quiet night without becoming another creature’s meal. The French divers did not find a new species. For a few minutes, they merely stepped into the everyday existence of an animal that witnessed seas rise, continents shift and climates change long before our earliest stories were carved in stone.

The blurred photographs from Indonesian waters point to something we seldom acknowledge: we remain remarkably ignorant about the planet on which we walk with such confidence. Vast parts of our collective history with life on Earth are still below, moving their fins through the darkness, untouched by our hashtags and headlines.