Prior to entering a compartment containing an atmosphere potentially dangerous to life or health, you should don an approved breathing apparatus. Which of the listed devices would be suitable?

Correct Answer: Option A — An SCBA

Self-Contained Breathing Apparatuses provide a completely independent, positive-pressure air supply, making them the only approved devices safe for entry into oxygen-deficient or toxic atmospheres. Canister gas masks and escape hoods lack independent air sources and offer insufficient protection in IDLH marine spaces.