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Uses US Gov public domain sample http://www.archive.org/details/SubmarineDiveAlarm (at either end). Extra high frequencies have been added , a request http://www.freesound.org/samplesViewSingle.php?id=104881 , [envelope also altered].
2013 UPDATE ... improved http://www.freesound.org/people/Timbre/sounds/203562/
Type
Wave (.wav)
Duration
0:30.509
File size
7.7 MB
Sample rate
44100.0 Hz
Bit depth
24 bit
Channels
Stereo