The stock game sets the sonar sensor Max Height at a number -9 (-300 to -9). So it it will not work at periscope depth. You can change this in Sensors.sim if you wish to have it work at periscope depth. Try to go down further a few feet until you hear it on the hyrophone station yourself.
I set mine for 1 hex less than the three given -6, -6, -9.
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