Free Online HD on Lookmovie. From PBS - Though much of the natural world is discovered and understood, a few great mysteries remain. Consider the eel, we know little about its life -- where it goes, what it does and how it dies. James Prosek, artist, writer and eminent naturalist, takes on the mystery of the eel, shedding light on the animal and the strange behavior it inspires in those who seek to know it.