The Siren Board

LOTS of ASC electronic sirens in attack. They apparently play a prerecorded message with the simulated attack signal, which is a first since most of the prerecorded ones on video use alert. There is one that peaks at the same pitch as a 5 port and sounded like it was about to blow like San Francisco's ATIs. There seems to be some siren in the videos that sounds like a low pitched Thunderbolt 1000T, and boy is it LOW. Those sirens sound creepy as all get out sounding off at once at around 2:47.
https://www.youtube.com/watch?v=NvXV3UIor-w

It could do without the music... regardless that's some impressive echoing/reverb ongoing with that entire system. Very impressive to hear that entire system sound off like that.

edit; Here's a similar video; https://www.youtube.com/watch?v=JVW1gG27sKg