Not sure if anyone cares but the 9/11 Memorial & Museum uses some kind of est system like est 3. I’d think they would also use firecom just like the wtc towers but I guess not. I don’t believe the WTC is related to the 9/11 museum instead running speareate from each other.
You can find the video here: https://youtu.be/i4VV4EUWEG4?t=702
Do you know what message and tone they play?