If there are creatures stomping around the universe who are capable of constructing a tunnel 600 quadrillion miles long, I hope they're friendly. At any rate, they probably are not interested in the outcome of the Seahawks/Redskins game.
If you feed it matter, it will convert something like 40% of that matter to pure energy. And shoot some of it out of the poles of the rotation of the infalling matter, at relativistic speeds. "Cap" one pole, in the sense of feeding interposing matter preferentially in front of one lobe of the jet, returning the energy so captured to the galaxy's matter circulation, and eventually back to the hole feed.
Then net recoil from the escape of the other lobe will move your galaxy. Presto, it's a spaceship. The whole civilization moves.