Where is the subsurface.log?

[Daniel Azuelos]

Hello,
Where is located the Subsurface log file ( subsurface.log )?
I am working with the Subsurface 4.9.7 on MacOS High Sierra.
I tried a:
	find ~ "*ubsurface.log"
like a pig: total failure.

May I turn this logging on?

( I would like to start to debug a BLE connection problem with
Aqualung i770R ).
-- 
    « The only thing necessary for the triumph of evil
    is for good men to do nothing. »
                                                Edmund Burke
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daniel Azuelos