The Beginning?

The Big Bang theory is how you explain what happened at the beginning of our universe. But what was there before the beginning? this is were scientist are stuck. How could nothing all of a sudden turn into something? What was there before the big bang some say god but who really knows. Our universe came about 13.7 billion years ago as a singularity.  After the inflation and expansion and the extremely hot temperatures the universe began to cool and expand into the universe we know now.