This is probably a large green grasshopper. Recorded at night, between 2 and 3 meters high, in the vegetation. Easy to loop. UCS Category: ANMLInsc. Duration: 00:25.
Sound of a group of "Bandas" (fanfare) in the streets of Argelès-Gazost, during a big musical party "Muchas Bandas", followed by another musical group.. noise of the crowd, joyful cacophony! Recorded in August 2018. UCS Category: AMBCele, CRWDCele. Duration: 01:33.
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: 00:12.
This is a sound file to calculate the speed of sound propagation in air. Two microphones 1 meter apart and a movie clapperboard to generate a sharp sound. Follow this tutorial to perform the experiment: lasonotheque.org/education-sonore-f4.html#propagation. UCS Category: TEST. Duration: 00:01.
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.