From Wikipedia the free encyclopedia Klaus Wennemann 18 December 1940 7 January 2000 was a German television and film actor Wenneman was born in OerErkenschwick North RhineWestphalia He is perhaps best known for his leading roles as the Chief Engineer the LI in Das Boot and as Faber in the TV series Der Fahnder As an actor he appeared in nine movies and ten television series He died in Bad Aibling Bavaria at the age of 59 from lung cancer He was married to the same woman from 1963 until his death they had two sons together Wennemann was good friends with fellow actor Jürgen Prochnow Their reallife friendship further added to the onscreen friendship of their respective character roles portrayed in the film Das Boot