Ran into a convoy the other day in heavy fog
Using next unit view
there were 3 AI uboats at the rear of convoy
Weather was so bad they hadnt been seen by escorts
I sunk 4 ships in one attack and then shadowed convoy
Every so often a sunk ship icon would appear in convoy meaning the AI boats had finally woken up
By the time I had reloaded torps and made a second attack they had all been sank