Beyond
Dykkerne (original)
During the final days of WWII, chaos ruled. The German submarine U-461 went down along with its entire crew just off the coast of Denmark. U-461 however, was no ordinary submarine. 50 years after the war ended, two brothers go scuba diving for fun and discover that their every move is being watched and that some things should just be left alone.
Starring Robert Hansen, Ralf J. Hollander, Otto Brandenburg, Jytte Abildstrøm, Baard Owe, Laura Aagaard, Jesper Asholt, Ove Christian Owe, Bjørn Floberg, Bjarne Henriksen
It's a action & adventure and science-fiction movie, and has a rating of 5.4 out of 10 from Imdb which is fairly okay for this kind of movie.
Watch it here
Not found streaming from Germany.