You need a sr staff member to teleport you out. I can't do it, but I'm giving a bump so hopefully you'll get seen. Log out of that server until a staff member is ready or you will eventually fall into the void and die dropping everything you have, but if you are patient it doesn't have to end like that
I remember that happened once, I had to have deathtomb TP out to me and push me out with a water bucket.