Set the life of the VIBR to 65535 and the tmp2 to -1 so the VIBR will not destroy itself
one deut/plut bomb levelled it, 1 part plutonium, 2 parts deuterium about the size of the 3rd ring of the bunker. it held out for a good minute and thirty seconds though, I would consider replacing the vibranium as it was the thing that finished the bunker off