The Wave (2017)

In Korea a wave is called a monster wave when it has come a long way with an enormous power. The wave is not very high, so it's very hard to distinguish it from the others. Only if it crashes an obstacle like a groyne it reveals it's lethal power and can build up to the size of a hill. Therefore accidents happens from time to time on the long coastals of the country. This film is based on the true destiny of a family that was torn apart by the power of the sea.