https://www.livescience.com/64452-spinning-black-holes-open-gentle-time-portals.html
So that begged one question: Suppose that hypothesis is true and we had a manned craft go through it.
My question: Would that be a one way trip or could they turn around and come home and also, would there just be one destination once entered or would you go to different 'universes' or 'dimensions', whatever depending on the angle or maybe velocity you enter such a place?