What is the role of the auxiliary (octopus) regulator?

The auxiliary regulator, commonly referred to as the octopus regulator, serves a vital role in scuba diving by providing backup air in emergency situations. This device is a secondary air source that is connected to the main tank, and it is generally designed to be easy to locate and operate. Should the primary regulator fail or if a diver experiences an emergency where they need to share air with another diver, the octopus regulator becomes an essential tool in ensuring safety underwater.

Having this backup system promotes a safety protocol that allows divers to maintain their safety and the safety of their dive buddy, facilitating air-sharing when necessary. This feature is particularly important in situations where a diver may run low on air or encounter mechanical issues with their primary equipment, hence why incorporating an octopus regulator is standard practice among divers.