It's not fool proof. It's just harder for their sonars to pick you up on the seabed, not impossible. If you see them going towards you, you should move.
If they’ve pinged you wait until they line up for a attack run, when they are about 150m away rig for silent running with the blue light on full power to engines hard left or right turn, dive and keep that turn going till your near the CD or bottom of the sea, when the enemies engines are facing you, slow speed and manoeuvre away, as soon as they start turn all stop, rinse and repeat
A number of things could have happened here. You could have been pinged be sonar or hydrophone per your initial detection. Following detection the nature of your maneuvers would determine how effective lying on the seabed would be, if they have your mark and you just plop down without much maneuvering they can get you just by attacking your last position. With extensive maneuvering and timing this strategy should offer a decent chance of evasion although it of course has drawbacks, in my experience I prefer running due to the many failures I’ve had in relying on the seabed or depth to save me.
Some things to go over for this scenario. Silent running and blue lights are good, did you switch to manual drive plane and check that all electronics were off? In addition the iron fist perk is great. From your description it sounds like you may have ran away with minimal maneuvering and set down, hydrophone tracking would lead to a depth charging of last position, potentially right on your head. If you took more drastic maneuvering it’s all a gamble but obviously better than the last scenario I described. In my experience ASW completely out paces our technology so your only hope is to exploit their weaknesses, the key one being in this scenario their own depth charges. When I employ lying on the sea bed I do so immediately after I lure the surface ship into dropping charges, they have a short period of contact blindness that I believe our hydrophones are also impacted by. This is a great time to rapidly maneuver to a new heading at full speed and cut power as you dive, ideally leaving no clues to your current position. Again, I really don’t trust this strategy, so assuming this works moving away from the enemy after you think they lost you and make sure to maneuver to keep your fore or aft pointed towards them to minimize sonar profile and scurry away. I have experienced being picked up on sonar on the seabed from hard port and starboard, it is a useful tool but wholly situational.
It's hard to tell if they spotted your periscope or heard your screws (propellers). Keep your periscope as low as possible and use speed 1. They can detect you from like 5km if you are using full speed.
It's not fool proof. It's just harder for their sonars to pick you up on the seabed, not impossible. If you see them going towards you, you should move.
If they’ve pinged you wait until they line up for a attack run, when they are about 150m away rig for silent running with the blue light on full power to engines hard left or right turn, dive and keep that turn going till your near the CD or bottom of the sea, when the enemies engines are facing you, slow speed and manoeuvre away, as soon as they start turn all stop, rinse and repeat
What is a CD and how do you know when somebody's engine is facing you?
"Crush depth" probably.
Thier engine would be facing you if they're moving away from you.
I looked it up and for destroyers it was in the middle of the ship
He means the propellers.. its not easy to tell if enemy is facing you from the sound alone. Sound travels in every direction.
Sorry mate I was having my frankfurter and leek dinner, crush depth mate
At that depth you should have a chance to reflect sonar due to temperature variations in the shadow zone
A number of things could have happened here. You could have been pinged be sonar or hydrophone per your initial detection. Following detection the nature of your maneuvers would determine how effective lying on the seabed would be, if they have your mark and you just plop down without much maneuvering they can get you just by attacking your last position. With extensive maneuvering and timing this strategy should offer a decent chance of evasion although it of course has drawbacks, in my experience I prefer running due to the many failures I’ve had in relying on the seabed or depth to save me. Some things to go over for this scenario. Silent running and blue lights are good, did you switch to manual drive plane and check that all electronics were off? In addition the iron fist perk is great. From your description it sounds like you may have ran away with minimal maneuvering and set down, hydrophone tracking would lead to a depth charging of last position, potentially right on your head. If you took more drastic maneuvering it’s all a gamble but obviously better than the last scenario I described. In my experience ASW completely out paces our technology so your only hope is to exploit their weaknesses, the key one being in this scenario their own depth charges. When I employ lying on the sea bed I do so immediately after I lure the surface ship into dropping charges, they have a short period of contact blindness that I believe our hydrophones are also impacted by. This is a great time to rapidly maneuver to a new heading at full speed and cut power as you dive, ideally leaving no clues to your current position. Again, I really don’t trust this strategy, so assuming this works moving away from the enemy after you think they lost you and make sure to maneuver to keep your fore or aft pointed towards them to minimize sonar profile and scurry away. I have experienced being picked up on sonar on the seabed from hard port and starboard, it is a useful tool but wholly situational.
What is the Mare Nostrum campaign? Are we talking about the uboat game?
Nighttime with extreme fog sounds like a terrible time to be submerged. Run on the surface and you’re hard to spot and hard to hear on sonar.
It's hard to tell if they spotted your periscope or heard your screws (propellers). Keep your periscope as low as possible and use speed 1. They can detect you from like 5km if you are using full speed.