Thirty-eight meters beneath the frozen ground of eastern Siberia, scientists discovered the preserved remains of immature fruits from a plant called Silene stenophylla, a small white-flowered plant related to the carnation family. These fruits were found in a ground squirrel burrow in 2012 and were determined to be about 31,800 years old, with a possible margin of error of 300 years. A team from the Russian Academy of Sciences, led by Svetlana Yashina and David Gilichinsky, successfully extracted living cells from these ancient fruits and used them to grow full, flowering, and fertile plants. This breakthrough, published in the Proceedings of the National Academy of Sciences, made Silene stenophylla the oldest multicellular organism ever regenerated from ancient tissue. The discovery was made at Duvanny Yar, a site along the Kolyma River in Siberia, where researchers explored around 70 ancient burrows of ground squirrels, which had been preserved in permanently frozen sediment. The key find, from a burrow labeled P-1075, was located exactly 38 meters below the surface. Inside, they found several immature fruits in excellent condition, surrounded by seeds and sediment. The burrow had been quickly sealed by ice, which helped preserve the fruits for thousands of years. Because the area has remained frozen, the dating of the fruits is considered highly accurate. The extreme cold played a crucial role in preserving the fruits. In such low temperatures, enzymatic decay and microbial activity are nearly halted, preventing the fruits from decomposing. However, freezing could not stop all processes. Over time, the fruits were exposed to natural radiation from the Earth's crust, which can damage DNA. Scientists calculated that the fruits received a radiation dose of 0.07 kilogray, which is near the threshold where plant tissues lose viability. This suggests that while the fruits were preserved, some parts, like mature seeds, might have been damaged beyond repair. To overcome this challenge, the researchers focused on the placenta, a tissue inside the immature fruit that connects developing seeds and contains cells capable of regenerating. They found that immature fruits often retained a funiculus, the stalk connecting the seed to the placenta, which had shown signs of growth in laboratory settings. By extracting the placenta and placing it in a nutrient-rich medium, the team was able to grow roots and shoots. Over two years, these shoots developed into full plants, producing flowers, fruits, and seeds. Using in vitro culture techniques, the team successfully grew 36 plants from tissue samples of three immature fruits. Today, Silene stenophylla still grows in the wild in Siberia, allowing scientists to compare the ancient plants with modern ones. The ancient plants were nearly identical to their modern counterparts up to the point of flowering, but their petals were longer and more spread out. Surprisingly, the ancient plants also produced seeds with a 100% germination rate, compared to about 90% for modern plants of the same species. These differences suggest that the plants may have undergone some genetic changes over 31,800 years, offering insights into microevolution. Permafrost, soil that remains frozen for at least two years, covers about 20% of the Earth's surface and acts as a natural repository for ancient biological material. In addition to Siberia, similar discoveries have been made in Alaska and the Canadian Yukon. However, rising global temperatures are causing permafrost to thaw, which could expose these ancient remains to degradation. What the cold preserved for millennia could be lost in just a few seasons once the soil thaws, highlighting the urgency of studying and preserving these frozen archives before they are lost forever.