Maybe Kardashev-scale 3 civilization looks like this. At the beginning of this text, I must say that wormholes or Einstein-Rose bridges are extreme things. Even if, they would be microscopic. They can transport energy and information from distant stars. And even if we could create a short quantum wormhole. That thing would revolutionize computing and information technology. But this text handles hypothetical, large-scale wormholes that could be possible in the distant future. The speed of gravitational waves is the speed of light. So forming the wormhole between the Sun and Alpha Centauri takes 4,5 years. But if those creators can create a black hole that they can use in travel. There is a possibility that they can make that travel. And nobody sees that they ever left. That thing makes it possible that they can travel back to the position in spacetime where the black hole formed. So black hole is the time loop that takes the traveler to the beginning point of the journ...