A remarkable study has revealed that tissue from the sea cucumber species Psolus fabricii can survive and regenerate for three years in natural seawater, raising questions about biological immortality. Researchers, led by Sara Jobson at Memorial University of Newfoundland, observed that the amputated tissue not only persisted but also displayed signs of growth and immune activity. Unlike previous studies that utilized sterilized environments, this tissue thrived in conditions filled with bacteria, showcasing its resilience. Although it has not developed into a new organism, the tissue's ability to heal and reorganize suggests significant implications for regenerative medicine. Rachel Sipler, a coauthor of the study, likened the situation to a lizard regrowing its tail, emphasizing the potential for understanding how such regeneration might occur. Andrea Bodnar from the Gloucester Marine Genomics Institute noted the importance of this discovery in exploring new biological innovations from ocean life. The findings could lead to advancements in limb regeneration research.