The passage of a spaceship. In reality, sound needs air to move: In the absence of air in space, no sound. Except at the cinema.. UCS Category: SCIShip. Duration: 00:05.
The note "G", on the metallophone, when counting down the time as in the 1000 euros game on France Inter, formerly "thousand francs game". I wrote an article about this sound, on the blog. UCS Category: MUSCChim. Duration: 01:00.
To diffuse in your house before opening to children :) An atmosphere created only with sounds from LaSonotheque: Wind, owls, owls, ghosts, chains, laughter and fighting cats. UCS Category: AMBDsgn. Duration: 16:54.
Several beeps of an active sonar. This is a low frequency sonar (long range but low definition). It is a triangular wave of 1030 Hz frequency easy to put in loop. In reality, a military submarine usually has passive sonar, more sonar info: en.wikipedia.org/wiki/Sonar. UCS Category: BOATSub. Duration: 00:31.
Civil siren of the "national alert signal" if the alert is over. 1 cycle of 30 seconds.
This is a realistic montage made using this imperfect sound, so feel free to do the same to make your siren sound like what you have in mind: bigsoundbank.com/national-alert-signal-remalard-61-s3257.html. UCS Category: ALRMSirn. Duration: 01:18.