Distance of a small propeller plane. Only after its passage over my head, we can only hear its distance. Until a bird flies away and forces me to cut the recording. UCS Category: AEROProp. Duration: 00:15.
Very big modern train horn. It is a construction train, stationary (no Doppler-Fizeau effect). Sound recording at about 100 meters. UCS Category: TRNHorn. Duration: 00:07.
Sound of a very large industrial switch. Like that of a shed or a very large room. Like you hear in the movies. This sound was created on a computer, with a switch noise, iron bar and reverb. UCS Category: MECHClik. Duration: 00:03.