If you have already seen Das Boot, then don´t watch this one.

Rating: Null/10 (29 October 2001)

For starters I should say that I saw Das Boot before this action packed Hollywood film. Propably that is why I don´t appriciate it too much. U-571 lends so many story/athmosphere elements from Das Boot, that the filmmakers should be ashaimed of themselves. BUT if you haven´t seen Das Boot then U-571 might be a more pleasant experience.
Rent Das Boot for true WWII submarine claustrophobia...