Octopus (alternate air source)

An octopus is a secondary regulator used for emergency air sharing when a buddy runs out of gas or experiences a malfunction.

How it works in practice

The device connects to your primary regulator set. Most rental kits in Koh Tao include one as standard gear. It stays tucked near your chest so you can grab it quickly. You will typically find it attached to the second stage of your regulator set.

It delivers air from your tank. The octopus provides breathing gas because it shares the same first stage and hose system as your primary regulator. This connection ensures that both divers breathe from the same air supply during an emergency.

The regulator works at your current depth. If you dive to 30 m in Komodo, the octopus delivers air at 4 ata of pressure. It is a simple mechanical link.

Why it matters for safety

Panic kills divers faster than low air. Keep it visible. I once saw a diver struggle because his octopus was buried deep inside a BCD pocket during a 22 m descent in Cebu. This delay creates panic.

Visibility is vital. Ensure the yellow color is bright and easy to spot in low visibility. You need to find it in seconds while your buddy is gasping for air.

Safety requires preparation. You should check that your octopus is easily accessible before you enter the water. A well-placed octopus reduces the time needed to establish a life-saving air share.

Common mistakes to avoid

Divers often hide their gear too well. I saw a student in Anilao tuck his yellow regulator behind a weight integrated pocket. He could not find it when his buddy’s pressure dropped to 50 bar.

Check your placement. Do not let the hose tangle with your computer or gauge. A tangled octopus is useless during a real crisis.

Don’t rely on luck. You must practice finding the octopus while you are still at the surface or in shallow water. This habit saves lives.

Connection to buddy breathing

The octopus is the tool for buddy breathing. Buddy breathing is the procedure where two divers share one air source. It is a fundamental skill for every diver.

It relates to gas management. You must monitor your SPG closely so that you do not reach 30 bar before needing an octopus. If your buddy hits 50 bar, you should already be preparing to share air.

The octopus is part of a larger system. It works alongside your BCD and your dive computer to keep you safe. Always confirm your buddy knows where your yellow regulator is located before you descend.

Check your octopus placement during your pre-dive safety check.