A scuba dive lets you explore marine environments without relying on surface oxygen tanks. It’s a unique opportunity to see the world beneath the sea in ways that no other experience can, including coral reef ecosystems and historical shipwrecks. And you can do it with specialized equipment that’s as safe as it is fun, including your own air tank (called a dive cylinder or BCD), mask, snorkel, fins and other gear.

The modern scuba diving system includes one or more gas tanks secured to the diver’s back, joined to an air hose that connects to a demand regulator (also known as a dive pump) that delivers breathable oxygen. The hose also connects to a buoyancy control device, which is an inflatable jacket that helps you maintain your buoyancy by adding or releasing air. The equipment is complemented by a wetsuit or drysuit to help you stay comfortable in colder water and a dive computer to monitor your depth and time underwater.

To get a real sense of what it’s like to be scuba diving, you can complete a Discover Scuba Diving experience with an instructor at your local dive shop or resort. Or, if you want to take your skills and comfort level up a notch, consider taking an Open Water Diver course. During this certification program, you will learn the basics of diving theory and practice in a pool to earn your first scuba diving certification. In addition, you will prepare to dive in the ocean by completing two confined water dives and four open water dives under the supervision of your instructor.