Webster

remember sonar looking down sees more in deep water than shallow water and that by being deep and going slow can and sometimes does guarranty they pass over you at some point so you can actually make yourself easier to detect by going 1 or 2 kts and taking forever and a day to get out of the path of that DD patrol area. i prefer moving in at periscope depth, ahead slow, silent running at 2 kts and wait for an opening to scoot in behind them ahead std when the DD turns away from me. works almost every time but if i am detected i am ready to put a fish in him.