A while ago I sneaked into Scapa Flow, found a couple of DD and attacked.
Got One, missed the other (100% realism is my excuse).
Anyway I traveled south to find that a subnet had been deployed

I decided to take a run up, surface at the last minute and "go over the top" With quite a bit of scrapping I got over. I damaged the boat a bit but with a bit of repair I was on my way.
Next time I tried it ... I sank

( in a type VII )

Questions
Are their different damage levels for different uboat types? ie can a type IX take more collision damage than a type VII?
Has anybody else done this, Or am I just foolish risking the lives of my crew?
Cheers Von Taticus.