Editing U-571 (film) (section)

===Technical inaccuracies===
As in most films, the audible sonar "ping" is not accurate, and is introduced for the audience's benefit.  The sound of WW2 German [[Gruppenhorchgerät]] system was more complex, whilst the more advanced [[ASDIC]] system used by the British Navy used frequencies outside the range of human hearing.

The [[Kriegsmarine]] destroyers rarely ventured out into the open Atlantic Ocean, but usually stayed in European coastal waters. During the [[German World War II destroyers|destroyer]]'s [[depth charge]] attack more than eighty depth charges are detonated in the film, despite the fact that they rarely carried more than thirty.<ref name="germandestroyers">{{cite book
 | last = Williamson
 | first = Gordon
 | title = German Destroyers 1939–45
 | url = https://archive.org/details/germandestroyers00will
 | url-access = limited
 | publisher = [[Osprey Publishing]]
 | year = 2003x
 | page = [https://archive.org/details/germandestroyers00will/page/n6 6]| isbn = 9781841765044
 }}</ref>

The German resupply U-boat would most likely not have been sunk by ''U-571''. This would have been difficult for a German U-boat to achieve, as German [[sonar]] was not as advanced as British during the war. The only instance of a submerged submarine sinking another submerged vessel was in February 1945 when {{HMS|Venturer|P68|6}} sank {{GS|U-864||2}} with torpedoes.<ref>{{cite web|url=http://www.uboat.net/boats/u864.htm|title=The Type IXD2 U-boat U-864 – German U-boats of WWII|website=Uboat.net|access-date=November 6, 2017}}</ref>

German [[Type XIV submarine|Type XIV supply U-boats]] or ''Milchkühe'' ("milk cows") did not have [[torpedo tube]]s or [[deck gun]]s, being armed only with anti-aircraft guns for defense, and therefore could not have attacked other vessels.<ref>{{cite web|url=http://www.uboat.net/types/xiv.htm|title=Type XIV Milch Cows (supply boats) – U-boat Types – German U-boats of WWII – Kriegsmarine|website=Uboat.net|access-date=November 6, 2017}}</ref>