The sense of the potential horror nuclear systems could well create is explored and graphically illustrated in this not to miss series. It shows how close a human catastrophe is and that there is little understanding how to deal with matters if they do go wrong. One of those films that makes you sit and think.....what if. Compelling watch in terms of acting, film making, research and delivery. It has a dark reality which your instincts say not to watch, but once started you cannot stop until the end...it left me feeling sad, angry, helpless and shell shocked that this sort of thing can happen....a similar feeling to my reaction to the film Schindler's list.