In 2017, the island of El Hierro, the smallest and westernmost of the Canary Islands, experienced a significant volcanic eruption, the first in 50 years. This event marked a milestone in the geological history of the Canary Islands, reminding us of the region's active volcanic nature. The eruption followed a series of seismic movements that began in 2011, known as the 'El Hierro seismic swarm'. These underground movements alerted authorities and the population to the possibility of an imminent eruption. Fortunately, the eruption occurred underwater, near the island's southern coast, minimizing damage to infrastructure and the local population. However, it had a significant impact on the marine ecosystem and the local economy, especially in fishing and tourism. This event underscored the importance of volcanic monitoring and disaster preparedness in the region.