Cave base map noise...
When I punched, stabbed, shoot, and/or blew up in its face.
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Game sound summary page - Provided by Zombie Man
Not sure if the specific sounds you are referring to are in there, Sapphic. It's a compiled list of identified sound files in the 'How to silence specific game sounds' thread.
Can you PLEASE for the love of GOD do away with the annoying humming noise in the council/5th column base maps. Is so darned loud.