This is a movie about a geological disaster that will happen: a mountainside collapse into a fjord creating a local, deadly tsunami. It is in Norwegian, with English subtitles -- but that is really incidental; you become submerged in this movie quite quickly and often forget that need to read.
The movie bears no resemblance whatever to a Hollywood disaster trope. There are no contrived plot-points; no terribly fake relationships. Only one cliche of note, and that forgivable. The Wave is crafted so that everything follows in its inevitability from initial precepts that greet you in the first minutes. The tension builds slowly and steadily, tautened like a steel rope until it sings under stress and must surely part. The acting is top-notch, perfectly natural; no too-pretty actors with their precious lines or precocious, clingy kids. Nobody quotes Dylan Thomas repeatedly. The camera amplifies everything, choreographed perfectly to accompany, not dominate, the scene. Likewise, the score is matched precisely, tone to image. It never creates its own solo bubble that might wash out the play.
When the terrible event occurs you see all the things as they might happen in real life. None too heroic or pathetic; nothing over the top; no magical saves. People in brief instant facing catastrophe, moving on, doing the needed thing. Connecting and assisting where they can. You will see moments warm and horrible, and will hold your breath more than once.
This one is among the best in its class, and is not to be missed.