Scientists found mystery bacteria inside one of the ocean’s most elusive whales

Marina: Welcome to Deep Voices — I'm Marina, a marine biologist who has spent way too many happy hours on research vessels, headphones on, listening to the ocean talk back. This podcast is where we dive into the world of whales and dolphins — their songs, their secrets, their families, and the science trying to understand what they're actually saying. Marina: A huge thank you to our sponsors who make this show possible: Ada, who helps businesses integrate A I into their workflows in smart, practical ways; Ago Consulting — that's "Ahh-Go" — brilliant minds in silicon development, working everything from A I to SoC; and Zen Semiconductor, an umbrella company with a whole portfolio of companies across the silicon industry. We love having partners who are as curious about the future as we are. Marina: Today on the show — a mystery bacteria hiding inside one of the ocean's most elusive whales, and what it might be telling us about their hidden lives. We're going to talk about the remarkable, goosebump-inducing science of decoding whale language — yes, including A I. And we're going to meet a ship doing something genuinely wonderful to keep whales safe in Alaskan waters. Stick around — this one is good. Marina: Okay, let's start with our first thread — Voices of the Deep. And I want to begin with a whale that most people have never heard of, which is honestly part of what makes this story so compelling. The pygmy sperm whale. Say that name out loud — pygmy sperm whale — and most people give you a blank look. They're not the humpbacks breaching magnificently in wildlife documentaries. They're not the blue whales that shake your chest with their low-frequency calls. Pygmy sperm whales are small, quiet, and deeply mysterious. They top out at about two and a half meters long. They look a little like a shark from certain angles, which has caused more than a few startled double-takes on the water. And they spend most of their lives in deep offshore waters, away from human eyes. Marina: We know so little about them that most of what scientists have learned has come not from watching living animals, but from studying ones that have washed ashore. Strandings. And recently, a team of researchers did something painstaking and important — they went back through decades of pygmy sperm whale stranding records and tissue samples, and they looked very, very closely at what was going on inside these animals' stomachs. What they found was extraordinary. Three previously unknown species of Helicobacter bacteria, living in the digestive tracts of these whales. Marina: Now, you've probably heard of Helicobacter — specifically Helicobacter pylori, the bacterium linked to stomach ulcers in humans. It took the medical community a long time to accept that a bacterium could survive in the acid environment of the stomach, let alone cause disease there. And now here we are, finding not one but three new relatives of that same genus, living inside the stomachs of one of the ocean's least-known cetaceans. Marina: All four of the infected whales in this study showed serious digestive damage — inflammation, ulcers, scarring, and parasite infestations. That's a grim list. Now, the researchers were careful — they did not confirm that these bacteria caused the whales' deaths. Science doesn't jump to conclusions like that without evidence. But finding three new bacterial species in animals that are already showing significant gut damage? That is a signal worth following. It opens a whole new line of inquiry into why pygmy sperm whales strand, and what's happening inside them when they do. Marina: What I love about this story — and I know it sounds odd to say you love a story about stomach ulcers in stranded whales, but bear with me — is what it says about how much ocean life we still haven't met. Three new bacterial species, found not in some exotic deep-sea vent, but in the gut of a whale. Hidden in plain sight, or rather, hidden in the deep. The ocean is still full of firsts, and that fills me with this profound sense of wonder and humility. We are beginners here. We are still learning the names of things. Marina: And communication — the voice angle — is woven into all of this, because the pygmy sperm whale's acoustic life is another frontier. They produce clicks, likely for echolocation. But their full vocal repertoire, their social sounds if they have them, their equivalent of song — we barely know. Every stranded animal is a tragedy, but also, in a careful and respectful scientific sense, a window into a life we'd otherwise never glimpse. Marina: Alright, let's move into our second thread — Culture and Decoding. And I want to ask you a question that I find almost dizzyingly exciting. What if we could actually talk to a whale? Not in a metaphorical, poetic sense — though that's beautiful too — but literally. What if we could understand what they're saying, and maybe even say something back? Marina: This is not science fiction anymore. It is science in progress. And it's moving fast. There's a project — and if you haven't heard of it, hold onto your headphones — called Project CETI. That stands for Cetacean Translation Initiative. CETI, like the search for extraterrestrial intelligence, SETI, but pointed at the ocean instead of the stars. The team behind Project CETI includes marine biologists, linguists, cryptographers, and A I researchers. Their target: the sperm whale. Marina: Why sperm whales? Because sperm whales have one of the most complex and structured vocal systems in the animal kingdom. They communicate using patterns of clicks called codas. Short, rhythmic, precise. Different clans of sperm whales have different coda repertoires — like dialects. Calves learn their clan's codas from their mothers and aunts. There are patterns within patterns. And the more researchers look, the more structure they find. Marina: What Project CETI is doing — and this is the part that makes me want to stand up and pace around, which I'm actually doing right now in my recording space — is deploying underwater hydrophones and A I to record, catalog, and ultimately analyze sperm whale codas at a scale never attempted before. We're talking about potentially billions of clicks, fed into machine learning models that can find patterns human ears and human eyes simply cannot detect at that volume. Marina: The Times of India recently ran a piece asking exactly the question that drives this whole effort: what if we could have a word with the whales? And it's the right question. Scientists working in this space are genuinely optimistic — carefully, scientifically optimistic — that within years, not decades, we may understand sperm whale communication at a level that lets us know what context certain codas appear in, what they seem to convey, whether they map onto anything like meaning the way human language does. Marina: And there's something philosophically enormous sitting underneath all of this. Sperm whales have the largest brains of any animal on Earth. Their neocortex — the part of the brain associated with complex cognition, social behavior, and in humans, language — is highly developed. They live in tight, multigenerational family groups. They have culture. They have dialects. They mourn their dead. The more you learn about them, the harder it becomes to believe their clicks are simple or arbitrary. The harder it becomes to not wonder what they know. Marina: There's also wonderful cetacean research happening closer to shore — literally. Researchers at Jacksonville University have been studying what they call "double dolphins" — their work on dolphin behavior and communication recently drew national attention in the United States. Details on that research are in the show notes — it's a lovely example of university-level science doing genuinely important work on dolphin social structure and how dolphins coordinate with each other. That coordination — the way dolphins in a group seem to move and communicate as a fluid, responsive unit — is itself a form of language. A language of synchronized bodies and sounds. Marina: Which brings me to something that stops me in my tracks every time I think about it. We have been recording whale and dolphin sounds since the 1950s. Roger Payne published his landmark work on humpback whale song in 1971, and it literally changed the world — it helped launch the "save the whales" movement because suddenly people could hear that these animals were singing. Complex, evolving, haunting songs that changed year to year across an entire ocean. And yet, more than fifty years later, we still don't know what humpback song means. We know males sing it. We know it spreads across ocean basins like a hit record. We know it evolves. But the why — the deep communicative why — is still open. A I might be the tool that finally cracks it. Marina: Let's go to our third thread now — a Cetacean-and-People story. And this one is happening right now, on the water, in Alaska. I want you to picture the Inside Passage. If you've never been, close your eyes and imagine a coastline so complex, so fractal, so studded with islands and fjords and glaciers that it looks like the edge of the world. The water is cold and dark and extraordinarily alive. Humpback whales feed there in summer. Orcas patrol the channels. It is one of the most biodiverse marine environments on the planet, and it is also one of the world's busiest cruise ship routes. Marina: And therein lies a genuine tension. Cruise ships are large. They move fast relative to a whale's response time. And whale strikes — ship strikes — are a documented cause of serious injury and death for large whales. Humpbacks, right whales, blue whales — they've all been killed or injured by vessel collisions. It's a conservation problem with real stakes, and it's been getting more attention from researchers, regulators, and increasingly, the industry itself. Marina: Here's the story that genuinely moved me this week. A new cruise ship operating in Alaskan waters has taken a step that I think deserves real recognition. They've brought a marine mammal observer on board — a trained specialist whose entire job, while the ship is underway, is to watch for whales and other marine mammals and alert the bridge so the ship can slow down or change course. Not as a PR gesture — as an actual operational role, with real authority to influence how the ship is navigated. Marina: Think about what that means in practice. You've got someone standing on deck, or up in an observation position, scanning the water with binoculars, listening, watching for a blow — that little puff of vapor that means a whale just surfaced somewhere ahead of you. And when they see it, they call it in, and the bridge responds. That's a human being standing between a hundred-thousand-ton vessel and a living creature that might weigh forty tons itself, and doing everything they can to make sure those two things don't meet violently. Marina: Marine mammal observers have been used in contexts like offshore energy surveys for years — seismic surveys that produce enormous underwater noise are required in many jurisdictions to have observers who can call a halt if whales are detected nearby. But bringing that role onto a cruise ship, voluntarily, as a proactive conservation measure — that's the industry moving in a direction that matters. Alaska Public Media covered this story, and it's worth knowing about. Marina: What I hope — and this is the optimist in me, the person who went into marine biology because she believed the ocean was worth fighting for — is that this becomes standard. That every large vessel operating in whale habitat has someone on board whose job is to look out for them. The technology to help with this exists too — there are passive acoustic monitoring systems that can detect whale calls and alert crews automatically. There are satellite tagging programs that help predict where whales are likely to be. There's even A I being applied to real-time whale detection from cameras and hydrophones. The tools are there. What's needed is the will to use them. Marina: And there's another layer to this story that researchers are just beginning to document. New research published recently through EurekAlert shows that human activity — noise, boat traffic, fishing pressure, coastal development — can actually reshape how dolphins organize their social lives. Dolphins in heavily impacted areas show different social structures than dolphins in quieter waters. Their group sizes change. Their bonding patterns change. The way they associate with each other — who they spend time with, who they trust — is being altered by the world we're creating around them. Marina: That's not a small thing. Dolphin societies are built on relationships that take years to form. A dolphin's social network — who its allies are, who it cooperates with, who it calls to when it's in trouble — is fundamental to its survival. Disrupting those networks by making the ocean louder, busier, and more stressful is a form of harm that doesn't leave a visible wound but is real nonetheless. And this is why the marine mammal observer on that cruise ship in Alaska matters — not just because it might save one whale from one ship strike, but because it represents a way of thinking about these animals as creatures with lives, with relationships, with things worth protecting beyond just their physical bodies. Marina: We are going to wrap up now, but I want to leave you with something to sit with. There are whales in the ocean right now singing songs we don't understand. There are dolphins restructuring their societies in response to the noise we make. There are pygmy sperm whales living lives so private that we only glimpse them when something goes wrong. And there are human beings — scientists, observers, engineers, A I researchers — who are dedicating their lives to the work of listening better, of causing less harm, of maybe, one day, saying something back. That project — the project of truly listening to the ocean — might be one of the most important things our species does. Marina: Deep Voices, brought to you by Ada, Ago Consulting, and Zen Semiconductor — thank you for supporting the science and the stories that matter. Marina: If today's episode sparked something in you — a question, a sense of wonder, an urge to learn more — please subscribe wherever you get your podcasts, and share the show with someone who needs a little more ocean in their life. All the studies, articles, and projects we talked about today are linked in the show notes — go explore them. The ocean has been talking for millions of years. We're finally learning to listen.