If we prep it right, a quick teleportation ritual shouldn't be too hard, in addition to the Hallow ritual and the convergence.  If we time it right, we can be miles away within a couple rounds of the convergence.<br/><br/>Edit: Though how big is this place, exactly?  There's a good chance that with a quarter-mile radius sphere of effect, this Hallow effect could catch the entire facility, giving us a huge advantage going in.