Most important things with TMO.
Weather/water conditions, you can get by with a lot when winds are up. If waters are calm, expect to be pinged.
Keeping a narrow profile, sometimes just turning and making yourself narrow will stop pinging.
You know about silent running, ect..
I stay at scope depth regardless during an attack, unless it's a huge convoy, then I'll go deep and come in from a narrow profile and come up in the middle of the convoy.
I find if I do most of my attacks from 1500 yards at a narrow profile I seldom get pinged. Sometimes it's best to just follow along, wait for night, worse weather, winds at least 5 kts. Early war you can go deeper and usually go under sonar, but later it gets hard to get deep enough and then get back up to attack in time.
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