Well this was what additionally helped Bletchley Park after the U-110 (Enigma and papers) to construct the "bomb", but also brought the escort crews to set their charges for deeper depths after realizing how deep the boats could really get .. bad for the U-boats.
Anyway it is an
atrocity to make a film, call it "U-571" and introduce US sailors to having captured the boat
Also interesting, on a british site you can read that "HMS Graph" was a Walther boat .. is it still all propaganda ?

I know England tested a Perhydrol boat with astonishing results, but only after the war and with a german crew to run it.
In reality this must have been the U-1407, or renamed to "HMS Meteorite".
Greetings,
Catfish