Well we know that gravity can distort space-time and if you imagine the Earth as a sphere being rotated in a pot of honey with the honey closest to the sphere being dragged around with it, where the honey is space-time being pulled along with the mass of the Earth........... and by default this must have some sort of connection with the Higgs field............. but before I get distracted with such things........... the wormhole theory suggests that one or more sufficiently massive objects, say a Black Holes for example, could distort space time so much that two very distant points in space time could be drawn together by a sort of trans-dimensional 'gateway' or 'wormhole' if you like. Nicely illustrated by your little image MikeG.
However the sort of forces at work within such a 'rift' in the fabric of space-time would likely make it less than suitable for organic life, or indeed as a form of transportation of any kind for phyiscal matter, but, if the theory holds then it might just offer a means to communicate across the vastness of the universe in a manner that would defy the accepted laws of physics.
You might even be able to communicate with your own past or future self?
But... as @@ points out, it is all theoretical.