In the siege of Jerusalem they dumped petroleum on the attackers. The benefit it continues to burn. You can also dump it and then shoot lighted arrows on the people below.
And he destroyed Jerusalem, along with all of the genealogical records and the temple.
Thus it will be with any such "bunkers" if the survivalist's dreams come true. Any such bunker will be descended upon by endless numbers of kamikaze survivors.
Unless the bunker is on an island, somewhere, that has yet to be mapped?