Real dead people?

I was watching a show tonight about the real story behind the movies.    This seen with dead people coming out of the pool to get the lady looks so real doesn't it?   Well there's a reason the dead look like real dead.   They are real dead body's.   It was cheaper to buy real dead people at the time, so they did.   I am not kidding around.  They are real dead human beings that the studio bought and placed in the mud to scare the crap out of you.    I mean that's the real horror of this movie.