The drone is very loud. You can hear it from hundreds of meters away. The rotors are moving at 0.8 Mach in order to achieve this speed. It's not obvious from th

The drone is very loud. You can hear it from hundreds of meters away. The rotors are moving at 0.8 Mach in order to achieve this speed. It's not obvious from this specific video, but if you watch a similar one from an almost identical drone you can realize how impossible it would be to get it close to anything critical unnoticed. https://www.youtube.com/watch?v=LbYEzEWvjr8&t=98s https://www.youtube.com/watch?v=LbYEzEWvjr8&t=98s