What is the purpose of a standby air supply in relation to the dive's safety?

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Standby air supply provides an immediate, independent air source for bailout or rescue if the primary system fails. By carrying a separate regulator and hose, this emergency air source allows the diver to continue breathing without relying on the main cylinder, giving time to ascend to safety or complete a rescue/bailout plan. It’s specifically about preserving air during emergencies, not about extending dive time, replacing the primary during ascent, or merely backing up a buoyancy inflator.