We kinda know what happens if you get sucked into a black hole because of math (spaghettification, what outside observers would see, etc); can the same be said about worm holes? Would you even notice if you passed through one? What would they look like? What would someone watching someone else go through a wormhole look like?
Let’s assume a big stable wormhole and the gravitational forces of surrounding supporting objects are balanced perfectly, so a human can pass through in a small space capsule in the center.
In this scenario, you would just see the region of the other side twice and the space in between, a circle around the hole, stretched until you’re going through. While going through, some objects on the outside would look stretched.
If it’s not perfectly balanced, you won’t survive going through without being squished or torn. If you come too close to avsurrounding supporting object, you’ll get slingshotted away or will fall into them.