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Choice of:

SDI Scuba-Certification Course for One SDI Scuba-Certification Course for Two

• Includes classroom and pool portions
• Four open-water dives
• Three-day rental of all scuba equipment

e-Learning SDI Scuba-Certification Course for One e-Learning SDI Scuba-Certification Course for Two

• Includes online classroom and e-Learning code
• Pool portion
• Four open-water dives
• Three-day rental of all scuba equipment

Student Training Pack ($100) and SDI processing fee ($39.45) not included.

Scuba Gear: An Underwater Survival Kit

Before you dive in for a scuba session, you’ll need to suit up in the proper gear. Preview the more complex parts of your outfit with Groupon’s overview.

Scuba unit: This is the piece that gives scuba diving its acronymic name: the self-contained underwater breathing apparatus. It controls your breathing and your depth through an air tank, a dive regulator, and a buoyancy-control device (BCD).

Air tank: This metal cylinder doesn't just hold the same stuff you breathe above the surface: the air in there is compressed at as much as 3,000 pounds per square inch. Because the water will add still more pressure, tanks are equipped with a device called a burst disk to automatically let air out if needed.

Dive regulator: Essentially, the dive regulator is the interface between you and your air tank, controlling where the air flows at the press of a button. Through one channel, it routes air to your mouthpiece; through another, to the air bladders inside your buoyancy-control device (typically worn as a vest or jacket).

Exposure suit: The climate you dive in dictates the type of suit you wear. Wetsuits provide enough insulation for temperate water, and drysuits keep you dry and extra warm via watertight construction. (Because they’re not breathable, drysuits have vents to control the amount of air inside the suit while descending and ascending.) Sometimes divers in tropical waters will wear only bodysuits, which guard against cuts and scrapes but provide no thermal protection.

Fins: Fins provide a large surface area to press against the water. This increases the impact of each kick, allowing you to move efficiently without using your hands.