Rescue Diver: what the course asks of you and what to study
In short
Rescue Diver teaches you to prevent, recognize and handle diving emergencies, your own and other divers’. With PADI, the minimum age is 12, and certification needs Advanced Open Water (or Adventure Diver with the navigation dive) plus first aid and CPR training within 24 months. The knowledge part ends with a final exam.
A diver surfaces near the boat, spits out the regulator and starts thrashing. Whether you jump in or throw something first is the kind of call Rescue Diver trains, in realistic scenarios and under pressure. Knowing the theory lets you make that call in seconds. This page covers who can take the course, what it teaches, how it’s assessed and how to study.
What does a Rescue Diver learn to do?
To spot trouble early, help a diver in difficulty at the surface or underwater, bring an unresponsive diver to safety and manage an accident until medical help takes over. Prevention comes first: most accidents grow out of a small problem nobody dealt with, such as a skipped check, a tired diver or an ignored air plan.
The certification also opens the door to professional training: Rescue Divers aged 18 or older can enroll in the Divemaster course.
The figures below come from the public pages of the PADI Rescue Diver course, read on November 11, 2026. Octo is an unofficial app, not affiliated with or endorsed by PADI. Other agencies, such as SSI, NAUI or CMAS, teach similar but not identical rescue courses, with their own prerequisites and procedures. When a procedure differs, your instructor’s version is the one to follow.
Safety
This page and Octo review theory only. They don’t teach rescue skills or first aid. Take a hands-on course with an instructor, and in a real emergency, call the emergency services first.
Who can take the Rescue Diver course?
The Rescue Diver course page sets these rules:
| Requirement | Detail |
|---|---|
| Minimum age | 12. Divers aged 12 to 14 earn a Junior Rescue Diver certification. |
| To enroll | An Open Water Diver certification, or its junior version. You can start the eLearning and the rescue exercises in confined water. |
| To certify | Adventure Diver with the underwater navigation dive, or Advanced Open Water Diver, or a qualifying certification |
| First aid | CPR and first aid training within the past 24 months. You can take it with your instructor. |
| Gear | Your scuba gear, a rescue breathing mask and an accident management slate |
The course page adds that there’s no strict minimum number of dives, though it recommends at least 20. It estimates 8 to 12 hours of eLearning and 4 to 7 days for the whole course.
What theory does the Rescue Diver course cover?
Four areas: prevention, problems at the surface, problems underwater, and rescue and care. Octo covers them in 12 lessons.
| Module | Lessons in Octo | What you learn | Go deeper |
|---|---|---|---|
| Prevention | 3 | Self-rescue, stress and panic, emergency equipment, first aid kit and oxygen | Glossary |
| At the surface | 2 | Helping a tired diver, handling a panicked diver | Practice questions |
| Underwater | 3 | A diver in trouble, missing diver procedures, an unresponsive diver | Barotrauma and lung injuries |
| Rescue and care | 4 | Rescue breaths in the water, getting a diver out, first aid for diving injuries, the emergency action plan | Decompression sickness |
The principles behind the scenarios:
- Stop, breathe, think, act. In any difficulty, your own or someone else’s, regain control of your breathing before you move.
- Stress shows before panic. Fast breathing, wide eyes, a mask pushed up, jerky strokes, fixation on one thing. A panicked diver acts on instinct and stops listening, so deal with stress early.
- Buoyancy first at the surface. Make yourself, then the diver, float: inflate the BCD, release weights if needed.
- Reach before you swim. Reach, throw, use a boat or wade, and only then swim out, taking something that floats.
- Missing diver. Alert early, gather the facts, mark the last-seen point and search the surface first. Underwater searches are for trained pairs, with a pattern and a time limit, and never at the cost of a second victim.
- Unresponsive diver. They need air, which means the surface: bring them up promptly and under control, the way your course trains you.
- Plan before the dive. Know where the oxygen, first aid kit, AED, radio and emergency action plan are before anyone gets in the water.
Try a question from the app
panicked diver, approach
At a boat pickup, a diver surfaces near you, spits out the regulator, pushes the mask up and beats the water, shouting. You’re in full gear, a few strokes away. What do you do?
Show the answer
Answer A. Assess from out of reach and try a command first; if contact is needed, come from behind or below with your regulator in, ready to drop underwater. Leaving the diver loses precious time.
What first aid principles does the course rely on?
For decompression sickness and arterial gas embolism, the first aid is the same: oxygen, lying down, an emergency call and close monitoring. You don’t need to tell the two apart before you help.
- Oxygen early: Divers Alert Network (DAN) says to provide emergency oxygen right away. Keep it going until medical help takes over.
- Call for help: DAN’s advice is to contact the emergency medical services first, then a diving emergency hotline such as DAN’s.
- Keep the diver lying down, sheltered from cold and heat, and watch their breathing.
- Never put the diver back in the water to recompress; treatment happens in a recompression chamber.
- Don’t wave signs away. DAN notes that symptoms can appear right after surfacing or up to 24 hours later. Divers often blame a sore shoulder on lifting tanks; DAN warns that this kind of denial delays treatment. More in six dive theory myths.
Chest compressions don’t work in the water, so CPR starts once the diver is out. The exact sequences, for rescue breaths and for CPR, come from your first aid course and current guidelines: follow what you were taught.
Try a question from the app
delayed signs
The evening after two dives, a diver in your group mentions numbness in both legs and an odd tiredness. They blame the long boat ride. What do you do?
Show the answer
Answer D. Numbness and unusual fatigue hours after diving can be decompression sickness. Never brush them off or “test” them with another dive.
How is the Rescue Diver course assessed?
On paper first, then in the water. According to PADI’s guide to the course and its exercises (March 2024, updated October 2025), the knowledge part has five sections, each followed by a knowledge review quiz, then a final exam. You study online or with the manual, and an accident management slate comes with it.
The in-water part starts with a review of self-rescue skills, then ten rescue exercises, which you may practice in confined water first. It ends with two open water rescue scenarios: an unresponsive diver underwater and an unresponsive diver at the surface. The guide notes that some divers see those scenarios as the course’s in-water final exam.
Octo doesn’t contain the knowledge reviews or the exam; its lessons and questions are its own.
How should you study for Rescue Diver theory?
Study each scenario as an ordered sequence of actions, since in a rescue the order matters.
- Learn to read a diver. Go over the signs of stress and panic until you spot them without thinking.
- Say the first three moves out loud for each scenario: a tired diver, a panicked diver, an out-of-air diver, a missing diver, an unresponsive diver.
- Know the first aid principles cold, and keep your first aid and CPR training current.
- Write an emergency action plan for a site you dive often: where the oxygen is, who calls, what they say.
- Answer scenario questions every day, then take a timed practice exam. Start with the Rescue Diver practice questions.
If your Open Water and Advanced Open Water theory feels rusty, review it too: the Advanced Open Water page is a good place to start.
Frequently asked questions
Can you take Rescue Diver right after Open Water?
You can start it. With PADI, an Open Water Diver can enroll, do the eLearning and practice the rescue exercises in confined water. To do the open water exercises and certify, you also need Adventure Diver with the underwater navigation dive, or Advanced Open Water, plus first aid and CPR training within the past 24 months.
Do you need a first aid course for Rescue Diver?
Yes. PADI requires CPR and first aid training completed within the past 24 months to certify as a Rescue Diver. If you don’t have it, you can take a first aid and CPR course with your instructor, often just before or during the rescue course. Keep it current afterward, since skills you never practice fade.
Is the Rescue Diver course hard?
PADI’s course page says many people find it challenging, and that countless divers call it their favorite course. The hard part is physical and mental: towing, lifting, decisions under pressure. The theory is manageable if you study it as sequences of actions, and knowing it makes the scenarios easier to run.
How deep can a Rescue Diver go?
Rescue Diver doesn’t add a depth rating. PADI’s published restrictions say the maximum depth depends on your earlier certification: 30 m (100 ft) for an adult Advanced Open Water Diver, 21 m (70 ft) for juniors aged 12 to 14. The limit of recreational diving remains 40 m (130 ft), with the right training.
What comes after Rescue Diver?
The Divemaster course, the first professional level, from age 18 (PADI also runs a junior program from 15). It adds dive theory (physics, physiology, equipment) and the skills to supervise certified divers and assist instructors. See what the Divemaster course involves and its prerequisites.
Sources
- Rescue Diver, official course page, prerequisites and FAQ (read November 11, 2026)
- Sarah Morlock, the Rescue Diver course and its exercises, official blog (March 27, 2024, updated October 2025)
- Andrew Keaveny, diving restrictions by certification level, official blog (February 27, 2024)
- Divers Alert Network, Treating decompression sickness (read November 11, 2026)
