I was reading an Anita Blake book. She’s raised a zombie, put it back and now they are digging up the grave, to see if there are problems with the zombie.
So the characters dug and talked. If this was a modern grave, they would have 
to open the coffin. Even if something had gone wrong with putting the zombie back, they were perfectly safe because it would be in the coffin. Modern coffins are steel.
I am thinking: The zombie would have broken the coffin, steel or not, to get out in the first place. When you put it back, the coffin would still be broken.
It is so weird. So very, very weird.
Story Treasury 