Out-of-Air Drill: Why DIR Divers Donate the Long Hose

Your teammate's eyes go wide. A hand slashes across the throat.

What happens in the next five seconds decides whether this stays a drill-like event or turns into a scramble.

In a DIR team, the answer is the same every time. They get the regulator you're breathing from. On a long hose. And you go to the backup under your chin.

Why donate the regulator in your mouth?

Most divers learn to hand over an octopus, a spare regulator clipped somewhere on the BCD. DIR teams donate the primary instead. Three reasons.

• It's known to work. You were breathing from it a moment ago.
• It's where they're looking. A diver out of gas goes for the regulator in front of them, usually the one in your mouth.
• Your backup has a fixed home. It's always in the same place, right under your chin. No searching.

The long hose is what makes it work. It gives two divers room to swim, ascend and get out together. See Long Hose Configuration.

What does a good gas share look like?

Slow. Calm. Almost boring.

The diver who needs gas is breathing from a working regulator within seconds. The donor is breathing too. The hose is clear, nobody is pulled into anybody, and the team is neutral and in position. Then the team makes a decision: continue to the exit, or ascend. And moves together.

Here's the thing. None of that happens because you read about it. It happens because you've done it so many times that the equipment handling takes no thought, so all your thinking goes to the divers, the failure and the exit.

What is the S-drill?

The S-drill is UTD's practiced version of gas sharing. It's taught from UTD Open Water onward, and it gets harder as training advances: sharing gas while swimming, during an ascent with stops, and over longer distances. The goal is a team that can share gas for the whole exit, not just for a few breaths on the bottom.

The exact sequence, hands, hose handling and positions are what we teach in the water. That's deliberate. A gas share half-learned from a web page is worse than one learned properly, because it feels like you know it.

Why does rock bottom matter here?

Because sharing gas only works if there's enough of it.

Rock bottom is the reserve that gets two divers to the surface, or the next gas source, breathing from one supply. Every diver carries it. The long hose and the S-drill get the gas to the diver who needs it. Rock bottom makes sure there's enough to finish the exit. See Gas Management for Recreational Divers.

Where do gas shares go wrong?

• Rushing. A fast, jerky handoff knocks masks and spills gas. Slow is faster.
• Losing buoyancy or position. Two divers focused on regulators forget about depth.
• A trapped hose. If the hose doesn't come free, the receiving diver gets pulled into the donor.
• No decision. Once both divers are breathing, the dive has changed. The team has to decide what's next.
• Practicing only in courses. A skill done three times in a class won't be automatic in a real emergency.

Here's the reality check.

The comfortable belief: I know how to share gas. I did it in my open water course.

The truth: you did it once, in calm water, with warning. The real one comes without warning, at the worst point of the dive.

Learn it with a team

Gas sharing with a long hose is taught and practiced in Essentials of Recreational Diving, alongside the team positioning that makes it work. Rescue Diver builds on it with self-rescue and buddy-rescue skills. For how teams work together on every dive, read Team Diving vs Buddy Diving.

When did your team last share gas? Not in a class. On a regular dive.