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