If you believe ol uncle Einstein, then the notion of a singularity is impossible and against all known laws. On the other hand a bridge, wormhole or vortex to another part of a universe is allowed inside a black hole. How the heck could we ever check? It has been thought its a one way trip. IT is BUT Here's how to check...If there is a BH somewhere in the universe where two stars orbit a black hole on each side of a black hole just outside the accretion disk, we could look for the gravity of the star behind the black hole...if it is not there, it was swallowed up by a gravity 'shadow' going down a drain . If the gravity is accounted for via lensing, ol Al is RIGHT AGAIN.

Your trip inside a black hole wormhole would be a wild ride of acceleration for awhile but gravity would not approach infinite and would actually slow down toward an emergence some place else. Your space craft would preferably be non magnetic inside a warp bubble to free you from inertial forces and radiation. Sorry, you will have no navigation in this macro quantum event.

Finding the ideal black hole off ramp from this universe is unlikely, making the ideal spacecraft is unlikely and getting to the off ramp is currently too far. But hey for sci-fi writers its instant gratification. Beyond the journey, could be the ultimate Gulliver's Travels.