SDI Open Water Scuba Diver Practice Exam 2025 - Free Scuba Diver Practice Questions and Study Guide

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What is the single most important rule of scuba diving?

Always dive with a buddy

Check your equipment before diving

Breathe continuously

The single most important rule of scuba diving is often considered to be breathing continuously. This principle is crucial because proper breathing is essential to maintaining both physical well-being and safety underwater. Divers must never hold their breath while ascending, as doing so can lead to serious injuries, such as lung over-expansion or embolism, which can be life-threatening.

By emphasizing the importance of continuous breathing, divers are reminded to stay relaxed and manage their air supply properly. This practice becomes especially significant during ascent, as changes in pressure can cause dangerous gas expansions if a diver holds their breath. In summary, continuous and controlled breathing is fundamental for safety in scuba diving, highlighting the body’s need for oxygen and the risks associated with improper breath management.

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Ascend slowly

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