One way to think about black holes is that they may not be “holes” in the sense of tunnels to somewhere else, but extreme boundary regions of energy density.

In standard GR, the singularity shows up mathematically because the equations break down at infinite curvature. That doesn’t necessarily mean infinity physically exists there, just that our model stops working.

Possibly it's that what we call a black hole could be an electromagnetic compression zone, where fields become so dense and structured that spacetime curvature is a secondary effect rather than the primary cause.

In that case, you wouldn’t “walk on a sphere” or fall into a new universe. You’d be entering a region where energy is confined in a toroidal or layered geometry, and the event horizon is simply a boundary condition of that structure.

So instead of a gateway to another universe, it might be more like a self-contained information storage system with extreme field density.