Open Water Diver Flashcards

What is the function of a submersible pressure gauge (SPG)?

Answer: Shows how much air remains in the scuba cylinder

The SPG displays the remaining cylinder pressure so the diver can monitor air supply throughout the dive.

Which hand signal means 'go up' or 'ascend' when used underwater?

Answer: Thumbs up

The thumbs up signal is the universally recognized underwater sign to ascend or end the dive.

What should a diver do if they lose sight of their buddy underwater?

Answer: Search for one minute, then ascend slowly and meet at the surface

PADI's buddy separation protocol is to search for approximately one minute, then slowly ascend and reunite at the surface.

When is it most important to breathe continuously and never hold your breath while scuba diving?

Answer: At all times, especially during ascent, to avoid pulmonary barotrauma

Holding your breath while ascending can cause expanding air to rupture lung tissue (pulmonary barotrauma), so breathing continuously is essential at all times.

What does negative buoyancy mean for a diver?

Answer: The diver sinks because overall weight exceeds buoyancy force

Negative buoyancy means the diver is heavier than the water displaced, causing them to sink without actively swimming upward.

What is the safest way to enter the water from a boat when wearing full scuba gear?

Answer: Giant stride entry with one hand holding mask and regulator

The giant stride entry — stepping off with one large step while holding your mask and regulator — is a standard and safe boat entry technique.

Which condition should lead a diver to cancel or postpone a planned dive?

Answer: Feeling congested or having difficulty equalizing on land

Congestion or difficulty equalizing on land indicates potential for ear or sinus barotrauma during descent, making it unsafe to dive.