Unseen embers can escape detection and threaten new outbreaks. Hot spots can linger unobserved for days and then burst into flame again. Escape routes can be obscured all too quickly by flames, smoke and foliage. Firefighters have learned to rely on their senses, but that's not always enough. They need help seeing what their eyes can't see. That's why infrared thermal imaging has become such a vital tool in wild land firefighting, helping protect lives and property.