![TIL the sounds that were heard from 9/11 and Ground Zero were not fire alarms - they were air tanks from downed fire fighters. : r/todayilearned TIL the sounds that were heard from 9/11 and Ground Zero were not fire alarms - they were air tanks from downed fire fighters. : r/todayilearned](http://farm3.static.flickr.com/2173/2384491669_a0006e452d.jpg?v=0)
TIL the sounds that were heard from 9/11 and Ground Zero were not fire alarms - they were air tanks from downed fire fighters. : r/todayilearned
![Personal Alert Safety System MotionSCOUT | Véhicules de secours et de lutte contre l'incendie - Sides Personal Alert Safety System MotionSCOUT | Véhicules de secours et de lutte contre l'incendie - Sides](http://www.sides.fr/wp-content/uploads/2016/12/motionSCOUT_2_10x7-546x382.jpg)
Personal Alert Safety System MotionSCOUT | Véhicules de secours et de lutte contre l'incendie - Sides
![Personal Alert Safety System MotionSCOUT | Véhicules de secours et de lutte contre l'incendie - Sides Personal Alert Safety System MotionSCOUT | Véhicules de secours et de lutte contre l'incendie - Sides](http://www.sides.fr/wp-content/uploads/2016/12/motionSCOUT_3_10x7-546x382.jpg)
Personal Alert Safety System MotionSCOUT | Véhicules de secours et de lutte contre l'incendie - Sides
![Personal Alert Safety System MotionSCOUT | Véhicules de secours et de lutte contre l'incendie - Sides Personal Alert Safety System MotionSCOUT | Véhicules de secours et de lutte contre l'incendie - Sides](http://www.sides.fr/wp-content/uploads/2016/12/motionSCOUT_1_10x7-546x382.jpg)
Personal Alert Safety System MotionSCOUT | Véhicules de secours et de lutte contre l'incendie - Sides
![Personal Alert Safety System MotionSCOUT | Véhicules de secours et de lutte contre l'incendie - Sides Personal Alert Safety System MotionSCOUT | Véhicules de secours et de lutte contre l'incendie - Sides](http://www.sides.fr/wp-content/uploads/2016/08/OK-superpass-215x297.jpg)
Personal Alert Safety System MotionSCOUT | Véhicules de secours et de lutte contre l'incendie - Sides
![X2 Camera, Iwfcam Motion Detection, Sound Detection, High-definition Night Vision, Can Be Connected Remotely And Short Distance - Temu X2 Camera, Iwfcam Motion Detection, Sound Detection, High-definition Night Vision, Can Be Connected Remotely And Short Distance - Temu](https://img.kwcdn.com/product/Fancyalgo/VirtualModelMatting/13666eb383a82243bdf1b26d0b1f5dcd.jpg?imageView2/2/w/500/q/60/format/webp)