How was the underwater birth scene shot in Mel Gypsy's movie "Apocalypse"?

These were all taken in a water tank. The water is so clean that you can even open your eyes underwater. Let me give you a few examples:

The underwater studio has many water tanks, which are integrated with the floor. One of the outdoor water tanks has a 240-foot × 60-foot blue screen, and there are also underwater filming facilities. . Live blue screens provide a consistent "wet to dry" feel that can provide stunning visual effects for movies, TV and commercials. The baby in the picture is sinking headfirst into the water. He is a natural beauty. On the upper right is the famous blue screen. Depending on this background, a variety of images can be produced. Below is a successful shot of the car sinking into the water.