Pools used for diving competitions in the Olympic Games are known as diving wells and must be at least 5 meters deep. A diver enters the water by launching off a springboard or platform located at the edge of the diving well.
According to North Carolina Aquariums, fish swim in schools because schooling protects them from predators, encourages reproduction and makes it easier to find food. Schooling also conserves energy, as each fish drafts in the wake of the fish ahead of him. This makes it easier for fish to swim long distances without exhaustion.