A scuba diver is someone who swims underwater while breathing air from a tank strapped to their back. The word scuba stands for Self-Contained Underwater Breathing Apparatus, which is a fancy way of saying “all the gear you need to breathe underwater without being connected to the surface.”

Before scuba diving was invented in the 1940s, people could only stay underwater as long as they could hold their breath, or they needed heavy diving suits connected to air hoses from boats above. Scuba diving changed everything. Suddenly, people could explore coral reefs, shipwrecks, and underwater caves with freedom of movement, staying down for an hour or more.

Today, scuba divers explore the ocean for many reasons. Some are scientists studying marine life or underwater geology. Others dive for recreation, marveling at colorful fish and coral formations. Some work as underwater photographers, while others search for archaeological treasures or inspect bridges and oil rigs.

Learning to scuba dive requires training and certification because divers need to understand how to use their equipment safely, how pressure changes affect their bodies at different depths, and what to do in emergencies. The experience of breathing underwater and floating weightlessly through an unfamiliar world is something many divers describe as magical.