Following on from Swansont's comment

 

"There is nothing we can interact with outside of the universe. It is inaccessible to us"

https://www.scienceforums.net/topic/125641-two-objects-going-near-the-speed-at-lightrelativity/?do=findComment&comment=1184766

 

Is it possible (within the realms of possibility) to construct a "sub  universe" whose inhabitants (not necessarily living inhabitants)  cannot perceive anything outside their construction and where  there exists a speed limit analogous to our own?

 

We,as the creators of this universe would be able to see in but the "inhabitants "  would be prevented  by their speed limit  from seeing out..

36 minutes ago, geordief said:

We,as the creators of this universe would be able to see in but the "inhabitants "  would be prevented  by their speed limit  from seeing out..

A black hole might fulfill the reverse of this. I don't know if someone inside a black hole (for however long they could continue to exist) could see outside, and we can't see in.

So if there was some inverse of this situation, possibly.