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The extremly long ships that traffic Danube have Engines with a characteristic sound. I don't know what Engines they have but here is a 135 meters long vessel, rather newbuilt and just now filled by some stuff like sand.
Type
Wave (.wav)
Duration
0:40.359
File size
6.8 MB
Sample rate
44100.0 Hz
Bit depth
16 bit
Channels
Stereo