The IND's Second System, explained

So here it is, my new longest video on this channel, beating Secrets of The NYC Subway - Part 4 by 38 seconds. This video will officially premiere while I'm on vacation on August 21st, so if you are reading this before that date, then you'll have to wait, sorry. When I come back from vacation, I will upload a video documenting my trip and what I saw, so stay tuned. Sound effects sources: Title: Window Glass Breaking Sound Effect (Royalty Free) Youtuber: Free Sound Effects Link:    • Window Glass Breaking Sound Effect (Royalt...   Title: World War 2 Air Raid Siren Alarm Sound Effect Youtuber: SoundEffectsFactory Link:    • World War 2 Air Raid Siren Alarm Sound Effect