I got to listen to a Hiroshima survivor talk about the aftermath when I was in the city a few years ago. I don't remember too many specifics since I was pretty exhausted at the time, just that it sounded absolutely fucking nightmarish.
PCM is definitely really good for compass unity - all you to bear in mind is that whatever you think you are, you're actually 3/4 of a quadrant up and right from that.
that's a dog, idiot