Since I'm brand new to SH3 I am using easy settings. I can see my stealth meter which is red. I tried diving deeper but I can go no more then 102m. I'm in a IXB in March 1941 time period.
First I'll try Brag's suggestion and see if I can slip away, if not, I will try to goto 30m and get a stern shot off, but it seems that destroyers that are following you avoid torps most the time because of their speed ( for me at least )
Thanks for the help and I'll let you know how it turns out.