Assuming that I can get into position, I tend to wait for them to come to me. I dive to let the lead destroyer sail over the top using the scope to make sure. From then on I wait till the merchants are within range - loose a few eels, normaly 1 per ship (not looking to sink , but wound).
I then dive under the convoy and try to stay under it whilst reloading - I figure that the ships above should mask sounds from the sub - plus it makes it difficult for the destroyers to get a clear run.
Rinse and repeat.
Afterwards (when safe) I come up to the surface and hunt the stragglers and wounded ships with the deck gun.
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