SDI Open Water Scuba Diver Practice Exam 2025 – Complete Test Prep

Question: 1 / 400

What is an effective technique for descending underwater?

Holding your breath to sink faster

Diving headfirst to gain speed

Using the exhalation of air to control descent rate

Using the exhalation of air to control descent rate is an effective technique for descending underwater because it allows divers to manage their buoyancy and ensure a controlled, safe descent. When divers exhale, they reduce the volume of air in their lungs, which decreases their buoyancy and helps them to sink more easily. This method allows for fine control over the descent rate, enabling divers to adjust their buoyancy by either exhaling or inhaling as needed.

Controlled descents are essential for safety, as they help divers avoid rapid descents that can lead to problems such as barotrauma or difficulty equalizing pressure in the ears and sinuses. This technique embodies the principle of buoyancy management, which is fundamental in scuba diving, allowing divers to remain relaxed and navigate underwater environments with greater ease.

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Swimming vigorously downward

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