This is essentially a bass guitar with distortion with three layers of notes, merged together to make a "siren" of sorts. It can be used as a fire alarm, or maybe an alarm on a spaceship or ufo.
The dutch city of leiden has a test of its civil emergency alarm, at midday on the first monday of every month. Here is a distant recording of the alarm as it is heard in a leiden soundscape.
I combined the sound of a bunch of different emergency vehicles for an episode of bloody, bold, irresolute. It's great for emergency situations and run-ins with the law.
Self-created fire alarm. The idea is based on the typical fire alarm in buildings and was supplemented by a typical (slightly pitched) sound sequence of the us emergency vehicles. The sounds and the composition were created completely with audacity. I would be happy about suggestions for improvement and how you have used the sound sequence. I used it as a fire alarm in my home automation.