@GR
It didnt rammed me actually, i rammed it. The nose dragging started at about 1/4 of the DDs length and kept up until the DD started turning. Thats more of 2/3 of the total length of it.
PS I think the DD was a Black Swan class and my boat is IXB
Edit: I remember seeing a hollywood movie about a submarine that cut ships apart like a chainsaw. It also had that spiky thing that german uboats have