PakoThePlatypus

I was thinking about spacetime today. Looking at the beginning of time (and space) we are not sure how it started. Some theorys suggest that the big bang happened from a single point called singularity, others that it happened everywhere at the same time. If it happened at a single point and is expanding, there needs to be an end of space (and time) in the form we know them today. So what happens if we reach that point? Can we just leave and come back like you would leave your house or do we enter another (kind of) world that existed before the big bang? If so, is the spacetime only some sort of a layer of a bigger structure or is it lying on some sort of infinite void? Also what laws of physics were present that an explosion like this could be created? Share your ideas and correct me if I'm wrong on any stuff above:) Also sorry for bad english