Prinzessinnenbad (2007)

A film about three teenagers - Klara, Mina and Tanutscha - from the Berlin district of Kreuzberg. The trio have known each other since Kindergarten and have plenty in common. The three 15-year-olds are the best of friends; they are spending the summer at Prinzenbad, a large open-air swimming pool at the heart of the district where they live. They're feeling pretty grown up, and are convinced they've now left their childhood behind.

Unfortunately the movie Prinzessinnenbad is not yet available on HBO Max.