This film is based on a real event that happened during the 2004 Indian Ocean tsunami. Maria (Naomi Wirtz Naomi Watts) and Henry (Ivan McGregor Ewan McGregor) take their three sons to Thailand for Christmas, only to find that the day after Christmas, when the happy family is enjoying a leisurely time by the pool, a beast-like wave of ten thousand feet is coming. Stunned by the sight, Maria was unresponsive and was hit by huge waves, and although Henry caught the two sons in time to escape, it was still too late, and the ferocious flood finally washed them away. Maria, who was once stunned by huge waves, woke up to find herself floating on the sea, and all the scenery around her had been submerged under the water. while she was convinced that her family had been killed, she found her eldest son Lucas, floating just a few meters away from her. As if she had been given a shot in the arm, Maria decided to do everything she could to leave with her eldest son Lucas alive.