Like it or not, we are looking at having to fight our way clear. Turn will give us some breathing room and then we have to fight our way through like a wedge. I am not really seeing too many other options.
How creative can we get with shove actions? We don't need to kill the undead, we just need to get past them.
Nice. Between that and fireballs, we might have a shot at it. Though we'd get a lot of attention as we went. Still probably better to get to the tunnel if we can.