I'm going to reiterate what has been said previously - make them pre-recorded announcements. I think if they were live then yes, it would kind of take away from the atmosphere and the feeling that Abe is sneaking around in places he shouldn't be. As an extra touch, why not make the announcements distorted and crackly as if the sound systems have been busted, adding to the fact that the place is abandoned and hasn't been maintained.
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