Could extremely advanced aliens build their own universe?

What kind of hypothetical alien supertechnology could it be? Alien megastructures like Dyson spheres could be impressive. Dyson sphere is a theoretical megastructure. Created by Dr. Freeman Dyson. That sphere is a giant ball that surrounds an entire planetary system. This kind of sphere is a theoretical megastructure. 

That sphere allows that civilization to use 100% of their star’s energy production. That is one technostructure. That SETI program searches. But could there be something more interesting? The Dyson’s sphere. Makes it possible to create the hollow singularity. The idea in that kind of system is that.

The sphere’s shell has three layers. The antimatter system detonates antimatter on both sides of the middle layer. That antimatter explosion. Or annihilation. pushes the ball's center layer.  A very dense. Could that even have enough power to turn the center layer of that ball into a singularity? That is unknown to us.  And that can make it possible to create a baby universe in the large universe. This thing can make civilization immortal. They could form their own universe. 

In our universe. In the model of the Matryoshka universe. That is one model of the multiverse. Multiverse means. The universe is one of many universes. The other universes can lurk in black holes. The idea of the Matryoshka universe is that. The universe is an infinite number of structures. They can be in different spaces. Or in different dimensions. That is a very interesting model. 

The size. Of that dimension can be small. If. We look at them from the outside. 

And this means. Those super aliens' UFOs can transport entire universes within their structure. Those hypothetical aliens could live in another dimension. If. Those theoretical aliens have a black hole in their craft. And there could be another universe in that craft. This kind of craft. It could be. A very. Small-looking thing. But if we jump in that craft. We would jump into another universe. And that kind of thing. It could be cooler than anything. That we ever imagined. 

Time dilation makes it possible. To create a model. About an immortal civilization. If. A civilization lives in a black hole. That thing cannot save our hypothetical civilization from destruction. 

When the universe expands enough. This. Causes black holes to be destroyed. But ultimate time dilation in a black hole causes an idea. That. This civilization can use black holes to transport themselves or information about their DNA to the past. In this text, I presume that aliens also have DNA. 

But the Matryoshka universe. That bases. A model in which black holes pack information. If. Black holes really can contain the universe. That means that even our body can be a quantum-sized universe. But what if we were in that universe? We would see it as big as our universe is. This causes an interesting thought. What if we were in the body of some gigantic creature? This is the thing. That makes the Matryoshka universe so fascinating. The intelligent aliens that can create that thing could live in our rooms. They could live in quantum-sized universes in quantum-sized black holes. 

https://bigthink.com/starts-with-a-bang/baby-universes-black-holes-dark-matter/

 https://bigthink.com/starts-with-a-bang/relativity-physics-immortality/

https://en.wikipedia.org/wiki/Dyson_sphere

https://en.wikipedia.org/wiki/Kardashev_scale

https://en.wikipedia.org/wiki/Multiverse