Dealing with crash survivor's guilt

(CNN) - Why me? It's the one question many people who survive horrific events ask themselves every day of their lives, and a question many are never able to answer.

It's even worse when someone is the sole survivor out of dozens of innocent people. Along with the memories of such a traumatic experience, they are also dealing with the emotional burden and pain from simply still being here, while so many around them died.

That's the topic of a stunning new CNN film. CNN's Rene Marsh has more.