Watch HDToday. Primal Fear" goes beyond the innate terror associated with our deepest fears to examine the history, psychology, and science behind what scares us most. Each fear - being burned alive under six feet of suffocating dirt, the strike of a lethal snake, terrorist attacks that can occur at any time - will be explored by looking at its history, the science behind it, and contemporary survivor stories that relate what a near-death experience was like.