Researchers have discovered what could be the remnants of a massive supervolcano off the coast of England. Located more than 450 million years ago, the volcano lies beneath the ocean floor, east of the counties of Norfolk and Lincolnshire. Its existence had been suspected for decades, but this study confirms its presence through geological surveys. The volcano was likely very active in the past, possibly qualifying it as a supervolcano—defined as a volcano capable of producing eruptions with widespread, even global, consequences. Supervolcanoes are rare but powerful, and while many are found in the Americas, there are also examples in Europe, such as the Phlegrean Fields near Naples, Italy. Evidence of this newly identified volcano comes from tephra—volcanic ash and debris—found in the region, suggesting a major eruption occurred along the British coast. Geological records also point to an eruption 453.7 million years ago that may have caused a global temperature drop of 0.5 degrees Celsius. However, the researchers caution that the passage of time has eroded much of the geological evidence, making it difficult to fully interpret the scale and impact of the eruption. This is not the first ancient eruption found in the area—other eruptions from the same period have already been identified, indicating that what is now England was heavily influenced by volcanic activity 450 million years ago. These findings add to the growing understanding of Earth's distant past and the powerful forces that shaped its surface.