Netflix's 2017 original series "Dark" was filmed in which language?

Dark is a German science fiction thriller web television series co-created by Baran bo Odar and Jantje Friese. Set in the fictional town of Winden, Germany, Dark concerns the aftermath of a child's disappearance which exposes the secrets of, and hidden connections among, four estranged families as they slowly unravel a sinister time travel conspiracy which spans three generations. Throughout the series, Dark explores the existential implications of time and its effects upon human nature.

Dark is the first German-language Netflix original series; it debuted on Netflix's streaming service on 1 December 2017. The first season received mostly positive reviews from critics, who made initial comparisons to another Netflix series, Stranger Things.

Netflix recommissioned Dark for a second season, which was released on 21 June 2019 to critical acclaim. The series was subsequently recommissioned for a third and final season. Filming began in late June 2019.