Yeah I did my first raid on Scapa Flow yesterday and realized that the destroyers was just sitting there. But I was happy because I play from a week back 100% realistic and set of 4 perfect torpedoes sinking the hood and queen elizabeth (if im not mistaking) with those torpedoes and raobf after planning my attack and all from 6000m away. The hit's were maybe just 1min apart after i calculated everything for both attacks and sending them of almost simultaneously. Very happy!!
What surprised me was the 2 destroyers following me maybe for 30km as I got out of Scapa Flow with out me noticing them and then attacking me from behind in the fog and I had to replay my escape 3times just because i almost had no batteries left and could only do 1kps submerged in max 70m deep water. So they chased me anyway even if it was not the destroyers in the harbor so I got some realism.