Klaus Wennemann (1940-1996) was a German actor best known for his iconic role as "LI" (Leitender Ingenieur - Chief Engineer) Fritz Grade in Wolfgang Petersen's classic film, *Das Boot* (1981). His intense yet measured performance contributed significantly to the film's success and emotional resonance, solidifying his international fame.

While *Das Boot* remains his most celebrated work, Wennemann had a prolific career in German cinema and television. He gained further popularity as the lead in the crime series *Der Fahnder* (1984-1993). He was esteemed for his charismatic presence and his ability to portray complex and credible characters. He was often cast in roles as strong, authoritative men with an underlying humanity, such as officials, military personnel, or leading figures, always demonstrating remarkable dramatic versatility.