Just after hanging up, you may encounter the ultimate struggle In this particular mission. Head to the 2nd floor to gather some ammunition — they will turn out to be useful in the forthcoming struggle. Be attentive and cautious, as zombies will look endlessly until you defeat the principle mutant. https://call-of-duty-black-ops-638159.blogoscience.com/40256629/call-of-duty-black-ops-6-gameplay-walkthrough-campaign-things-to-know-before-you-buy