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Buoyancy Control Device, a piece of diving equipment used to control a diver's buoyancy underwater.

An electronic device used by divers to monitor depth, bottom time, and decompression requirements in real time.

A device that reduces the high-pressure gas from a diving cylinder to ambient pressure and delivers it to the diver.

Acronym for Self-Contained Underwater Breathing Apparatus, equipment allowing divers to breathe underwater.

A pre-dive check performed with your partner to ensure all gear is functioning and properly configured.

The process of equalizing pressure in the middle ear during descent, typically by swallowing or gently blowing while pinching the nose.

A hand signal used to communicate that everything is all right, typically a circle made by joining thumb and forefinger.

A hand signal given by pointing downwards with the thumb, indicating the need or desire to move down in the water.

A hand signal used to communicate a problem or that something is wrong, often by shaking a flat hand back and forth.

A state where a diver neither sinks nor floats, achieved by balancing buoyant and gravitational forces.

A hand signal typically given by placing a hand flat over the head, indicating a serious problem or threat.

A hand signal implying to remain in current position, usually signaled by flattening a hand and pushing downwards.

The maximum depth from which a diver can ascend directly to the surface without a decompression stop, due to nitrogen absorption.

An emergency situation where a diver has no remaining breathable gas, requiring immediate ascent or gas sharing with a buddy.

A short pause at a shallow depth at the end of a dive to decrease the risk of decompression sickness.

A hand signal given by pointing upwards with the thumb, indicating the need or desire to move up towards the surface.

The time spent on the surface between dives, allowing nitrogen to off-gas from the body to reduce decompression risk.

A reversible alteration in consciousness that occurs while diving at depth, caused by the anesthetic effect of nitrogen under pressure.

A breathing gas mixture of nitrogen and oxygen with a higher than normal oxygen content, typically 32% or 36%.

A potentially lethal condition caused by nitrogen bubbles forming in the bloodstream and tissues when ascending too quickly.

A safety procedure where divers operate in pairs for mutual support and assistance.

A hand signal used to indicate that a diver's air supply is running low, usually done by placing a flat hand on the edge of the throat.

The balance and position of a diver in the water, affecting hydrodynamic efficiency and air consumption.

Submersible Pressure Gauge, a device that displays the remaining pressure in a diving cylinder.