If it would be so simple, I wouldnt have posted.
Yes, of course I start in a crawl, and the first thing I do when mission screen opens, is going to super-silent and into a dive, just in case, and checking if and where layers are.
Im talking about getting pinged or heard and then pinpointed by torpedoes with precision and shortest reaction times and under conditions where I find this very hard to imagine possible from Sub Command and Dangerous Waters and Janes 688.