About a year ago I had a really terrifying experience...
Was attacking a convoy with massive ships in super-lousy weather...
Positioned myself so that the convoy would "run me over" and there was some real tension when waiting what would come out of the mist...
Then out of the mist comes the lead destroyer right at me, but he was zig-zaging...so he turned and I can't imagine how close it must have been that he rammed me (100% realism no external view) because when I lowered my scope he was almost heading right at my aft...so just hearing his engines and waiting for a big crash-sound and the "Das BooT isT bescHädischGT Herr kaleuN !!!" I heard him pass me by.
Then no more ships was spotted but my hydrophone was giving away sounds at all angles and I was like
Then I put all ahead full (still submerged ofcourse) and ended up going along side a whale factory ship on 12000 tons...gathered the solution data and set all torpedoes for magnetic pistol.
All 3 torpedoes hit and I escaped undetected in the deep. Taking the whale factory ship with me ofcourse.
