How did you film the part where she disappeared in the sea?

The sea scene in the movie "The Lost Girl" was shot in a huge water tank. The tank is placed in a specialized studio that simulates the movement of waves and seawater. Actors need to perform in a water tank while overcoming difficulties such as buoyancy, current and temperature in the water. In order to achieve realistic effects, the film production team used many techniques and methods, such as using professional divers and special effects teams to assist shooting. At the same time, many advanced technical equipment are also used in the water tank, such as underwater cameras, underwater lighting and sound equipment, etc. Through the cooperation of these technologies and equipment, the impressive sea scene was finally presented.