In this view, space is filled with a network of Wormholes, something like the Wormholes in an apple. Although by no means is this point demonstrated, it is merely an exciting suggestion. If it is true, then, perhaps there exists gravity tunnels, a kind of interstellar or intergalactic subway which would permit you to get from here to there in a much less than the usual time kind of cosmic rapid transit system.
We can not generate Blackholes, our technology is far too feeble to move such massive amounts of matter around. But perhaps someday it will be possible to voyage hundreds or thousands of light years to a Blackhole like Cygnus-X1. We would plunge down to emerge in some unimaginably exotic time and place. Our common sense notions of reality.. severely challenged.
Perhaps the Cosmos is infested with Wormholes, every one of them a tunnel to somewhere. Perhaps other civilizations with vastly more advanced technologies, are today, riding the gravity express. It’s even possible that a Blackhole is a gate to another, quite different Universe.