civilext on Instagram: "The most dangerous wildfires aren’t always the ones you see—some burn silently underground for weeks or even months, waiting to resurface. Underground root fires—often called ground fires or zombie fires—burn deep beneath the surface in roots, peat and organic soil layers. Nearly invisible, they can travel long distances, survive under snow, and reignite wildfires without warning. These smoldering fires move slowly but relentlessly, making them extremely hard to detect an