I would like to know if there were any ways for WW2 submarine to fake death/explosion/wreckage in the event where they are spotted and attacked from beyond.
Would this require specific tools ? Like for example, it is easy to imagine a way to release some floating debris, oil, and bubbles of air, while you stop your engines and play dead.
I am interested specifically in WW2, but if you have specific answers from other periods of time, please share them as well.