Around 631,000 years ago, a massive volcanic eruption took place in what is now north-western Wyoming, part of the same volcanic system that today includes Yellowstone National Park. This event, known as a super-eruption, released vast amounts of ash across North America and had global climate effects. At that time, early humans had not yet migrated to the continent, so no one directly experienced the event. However, such eruptions are rare and powerful, capable of reshaping landscapes and affecting global systems. Today, scientists closely monitor Yellowstone’s volcanic activity using a network of seismometers, GPS stations, and other instruments. These tools help detect changes in the Earth’s crust, such as earthquake swarms, ground movement, and gas emissions. Recently, the University of Utah Seismograph Stations recorded a series of sharp spikes in seismic data, raising concerns about unusual activity beneath Yellowstone’s caldera. Over the following months, the earthquake swarm continued to move upward, accompanied by ground uplift and increased strain—signs that magma might be moving into the crust. The Yellowstone Volcano Observatory (YVO) responded by raising the alert level from "normal" to "advisory," indicating that volcanic unrest had exceeded typical background levels. The likelihood of a major eruption increased from 6-9% to 21-27%. The U.S. Geological Survey (USGS) raised the Aviation Colour Code to orange, a warning of heightened volcanic activity. A press conference followed, stating an 85-92% chance of a catastrophic eruption within three weeks, prompting an evacuation zone extending 100 kilometers beyond the park. The eruption began with a series of shallow earthquakes and phreatomagmatic explosions—explosions caused by magma interacting with water—sending superheated steam, mud, and rock high into the air. The immediate effects were devastating, with destruction within 4-6 kilometers of the eruption sites and pyroclastic density currents—fast-moving clouds of hot gas and volcanic matter—causing widespread devastation. The eruption column reached 30-50 kilometers into the atmosphere, casting ash across North America and disrupting power grids, water supplies, and communication systems. In the days that followed, the eruption continued in pulses, with repeated collapses of the eruption column generating more pyroclastic flows. Infrastructure was severely damaged, and communities faced darkness, breathing difficulties, and roof collapses from heavy ash accumulation. The eruption also triggered a volcanic winter, as sulphate aerosols in the atmosphere reflected sunlight, potentially cooling the global average temperature by up to 1.5°C. In the years that followed, the world faced long-term recovery challenges, including changes in agriculture, water shortages, and health issues from ash exposure. While the eruption caused significant global disruption, it did not lead to the end of human civilization. Over time, the planet recovered, with vegetation returning and ecosystems adapting to the new conditions.