A spinning star in star in the process of collapse increases the speed of rotation because of the conservation of angular momentum. The singularity becomes a ring of neutrons manifesting extraordinary centrifugal force outward, countering the force of gravity on the inside. This ring is called a Kerr Ring.

An object falling into the black hole would pass through the Kerr ring and exite via the white hole, perhaps within the same universe at a different location or time, or perhaps in a parallel universe.

Any travel through this Kerr ring would be necessarily one-way. The gravity created by the collapse, though no longer sufficient to kill the individual, would prevent a return trip. A person would not survive the trip because of the large gravitational forces and high energy in the space between the black and white hole. The bridge between the black and white holes is also unstable and could close at any time.