Before the Big Bang there was "heaven", going by the Genesis account.
"In the beginning, God made the heavens and the Earth."
Where was God when he made the "heavens" and which "heavens" are we talking about?
If heavens meant our material universe, I suspect that the "void" we call outer space, has always existed, because the void is nothingness and you can't create nothing because it is "nothing". It's just empty "space" to put things in.
I'm not sure about a "big crunch" because if the universe is 14 billion years old, it would take 14 billions years at the speed of light for universe to "crunch" because nothing could go faster than the speed of light.
Several years ago, there was a space probe called COBE that detected "ripples" from the after shock of the Big Bang.
https://en.wikipedia.org/wiki/Cosmic_microwave_background
Just my 2c
Truthseeker