Scientists Intrigued by Chunk of Flesh That Refuses to Die After Several Years

Researchers at Memorial University of Newfoundland have discovered that amputated tissue from the sea cucumber Psolus fabricii remains alive, heals, and grows for years in natural seawater. This finding, published in May 2026, challenges long-held biological assumptions about tissue decay and offers a potential new model for studying cellular regeneration and immortality.

The Discovery of Persistent Tissue Survival in Psolus fabricii

Die After Several Years Psolus fabricii

For nearly two centuries, the prevailing biological consensus held that animal tissue removed from its host had a finite future: decay. While individual cell lines, such as the famous HeLa cells harvested in 1951, can replicate indefinitely under sterile, nutrient-controlled conditions, complex tissue structures typically degrade rapidly once separated from an organism. That paradigm has been interrupted by the discovery of Psolus fabricii, a small, reddish sea cucumber native to Arctic and North Atlantic waters. As reported by Futurism, researchers found that amputated samples of this species not only survived for three years but continued to grow and repair themselves without the support of a host body. Unlike previous laboratory experiments that relied on axenic or sterile cultures, these specimens were maintained in natural, flowing seawater—an environment typically hostile to wounded tissue due to the presence of microbes, sediment, and organic debris. “This is naturally occurring tissue immortality. Having tissues that survive that easily is unheard of. We’ve never seen anything like this.” Sara Jobson, researcher at Memorial University of Newfoundland, via Futurism

Biological Mechanisms and the Zombie Tissue Phenomenon

The survival of Psolus fabricii explants is not merely a passive state of suspension. The tissue demonstrates active biological processes, including immune activity, cell cycling, and the absorption of nutrients from the surrounding water. According to Ars Technica, the research team noted that these tissues reorganize their structure to suit their new state, a process the investigators have colloquially dubbed “zombies.” While the explants do not regenerate into a complete, new sea cucumber, they function as independent, structured entities. This distinction is critical for researchers attempting to categorize the specimens. The tissue is not dead because it avoids decay, yet it falls outside the traditional definition of a living organism because it does not reproduce. The researchers suggest that the tissue is effectively restructuring itself to optimize survival in its current, detached state. “The question we get a lot is ‘are these tissues actually alive?’ and this is where it becomes kind of philosophical—we lovingly call them zombies. They’re not growing into a new sea cucumber but restructuring into a form that best suits them in their current state. So, they seem to be functioning as a whole new entity.” Sara Jobson, researcher at Memorial University of Newfoundland, via Ars Technica

Comparative Analysis and Medical Research Implications

cluster (priority): Earth.com

The unique resilience of Psolus fabricii appears to be distinct among echinoderms. In comparative experiments, researchers tested related sea cucumber species, but none exhibited the same long-term survival rates. This suggests that the capacity for such profound tissue maintenance is not a universal trait among the group, but rather a specialized biological innovation. As noted by Earth.com, the ability to study complex, living animal tissue without the ethical complexities of experimenting on live organisms presents a significant opportunity for biomedical science. Because sea cucumbers are evolutionarily closer to mammals than many other laboratory models, they offer a unique window into regenerative biology. “This discovery highlights that the ocean holds profoundly unexpected biological innovations. The fact that tissue explants from a sea cucumber can heal, reorganize, and survive independently for years in natural seawater suggests an entirely new model for biological resilience and tissue regeneration.” Andrea Bodnar, science director at Gloucester Marine Genomics Institute, via Futurism

Future Questions for Evolutionary Biology

Despite the excitement surrounding these findings, significant questions remain regarding the fundamental nature of this resilience. The research team is currently investigating whether this ability is a direct evolutionary adaptation or simply a byproduct of the sea cucumber’s high baseline regenerative capacity. Furthermore, the longevity of Psolus fabricii in the wild remains difficult to quantify, as there are currently few tools available for accurately aging these creatures. Current efforts are focused on the “how” of this phenomenon. Scientists are looking for specific genetic or cellular markers that enable Psolus fabricii to resist the decay that claims the tissues of almost every other animal. As the research continues, the scientific community is watching closely to see if this “zombie” tissue can provide a roadmap for new approaches to tissue engineering and medical research. “We haven’t grown a new, complete sea cucumber yet, but we are seeing pretty stunning growth and diversification of cells literally years after this tissue was removed. It’s like a lizard that loses its tail. We know some lizards can grow new tails; we’re talking about whether the tail can grow a new lizard.” Rachel Sipler, senior research scientist at the Bigelow Laboratory for Ocean Sciences, via Earth.com