Pile of shells around dwellings of the Stone Age prove that people caught food under the water. Free-diving started by getting food or trading items, but it has developed as leisure, with divers taking photos today. Today, free-diving is widely practiced as a leisure sport like snorkeling and spearfishing. Anyone can go to the sea and see all kinds of sea animals. Also, free-divers can feel peaceful in the water. Free-diving has grown in the past 10 years by many people want to be with nature.