Hi, well, I´m not an expert but I guess the "tutorial" starts right after you have been detected so whatever you do the escort will come after you... Your best chace here is to sink the destroyer. Escorts in this game make a terrible mistake: if they detect you they will come directly heading to you at full speed so head the sub to them and fire a magnetic detonator fish when she´s at 500m more or less, if they don´t sink they will just try to go away.
Hope this helps!
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