The Probability of Instabilities in Theories With Extra Dimensions

In theories that have extra dimensions, a vacuum could actually decay to something that is true nothing. This type of instabilities can only occur in theories that contain extra dimensions. So we can imagine for dimensional universe with a fifth dimension that is perhaps, you know, a tiny circle, a bubble of nothing could nucleate in this four dimensional vacuum. And it would look very much like a spherical bubble inside of which nothing exists and the space time no longer exists.