sentence: Several pictures appear onscreen during the opening. sentence:  A woman is underwater in a scuba diving suit. sentence:  She is swiming next to two men in a pool. sentence:  Two women are shown talking about snorkling. sentence:  There are fish swimming in the tank as the people look at them up close. sentence:  Classes are shown for teaching snorkeling before people begin diving into a river to look at the times on the floor. sentence:  A large shark is shown swimming past.