After one has crossed over into the complex world of singularities, quantum mechanics must be used. If an object, say an astronaut, crosses the event horizon, it is inevitable that the astronaut encounter the singularity hiding at the center of the black hole. If there is an observer on the outside of the black hole watching the astronaut fall in, that observer will have experiences. The astronaut that falls into the black hole will experience a finite time interval between his crossing the event horizon and encountering the singularity, but the observer on the out side of the black hole will experience an infinite amount of time between seeing the astronaut cross the event horizon and fade away into depths of the black hole. Billions upon billions of years may have passed for the observer on the outside of the black hole, because to the observer on the outside of the black hole, it seems as though the astronaut with the poor luck of being captured by the black hole is simply trapped a one point in space and in time.
Worm holes are possible gateways that connect different points in space-time.
To be more accurate, worm holes can connect two different points in space, time, or space time. When a worm hole connects two different points in space, an object can move from one point in space to another point in space. When a worm hole connects two different points in time, an object can move from one point in time to another. In a sense, this worm hole is actually a time machine. When a worm hole connects two different points in space time, it can transport an object from one point in space-time to another.