The concept reminds me of the theory explaining why you can't leave the universe, aside from the obvious limitations in transport to a perpetually expanding three-dimensional horizon. Basically, the theory is that our universe is a three-dimensional object within four-dimensional space. Like how a line makes up a square and a square makes up a cube, the universe is a less complex piece of a more complex form. In our universe, the fourth dimension of time passes along the weave of the fabric of spacetime but cannot be tranversed outright, instead it simply passes as it feels. A four-dimensional object would be able to pass through all regions of space at any point it wants. Time is the additional complexity that defines our universes boundaries but we can't tranverse it just follow it. Objects are three dimensional things bound together by the fourth dimension, essentially.

If you take a two-dimensional pencil drawing person like 085 and draw them onto a paper globe, they could pick a direction to walk in and eventually find themselves back where they started with absolutely no grasp of how they reached that point again. The place the two-dimensional person is in may seem infinite from his or her perspective, but if you are a three-dimensional person observing the two-dimensional person's journey, the region they are traversing actually seems quite easily quantifiable even numerically. For example, a paper globe with a circumference of 26 centimeters.

It's not that there isn't matter beyond the "looping" region of our universes boundary, or that the region spans infinitely within a finite area, it's that the area isn't looping at all technically and instead just following a slightly more complex rule set spatially that we can't navigate just three-dimensionally.

Like how once you cross the defineable boundary of a black hole's event horizon, any direction or point you traverse to leads towards the singularity. Even if you walked forward across the boundary and immediately backpedaled you'd be going closer to the singularity and further from the event horizon which by all previous logic should have been directly behind you. Nothing including light can exit the event horizon of a black hole and because of that you couldn't send a radio wave out from inside a black hole.

That's a three-dimensional way to create a space-time trap, but when four dimensions get involved just about any mundane area could trap a three-dimensional being just because they'd get disorientated with where and when they are and be physically incapable of crossing space in the way required to exit. Who is to say a three-dimensional person can't take a partial strip from the sheet paper that a two-dimensional person is on and fold it into a tube?

There is paper between the loop and the sheet that would allow you to draw an unbroken line across the boundary (like a radio wave needs matter to transmit through space) but the looped strip that line is coming to the paper from is just too confusing for any two-dimensional person bound to the third dimension to navigate their way out of.