What to Expect in Your Open Water Training Dives (The 4 Certification Dives)

# What to Expect in Your Open Water Training Dives (The 4 Certification Dives)

> The pool is over and you're heading to the ocean. Here's exactly what happens across the four open-water dives that turn you from a student into a certified diver.

## Why the open-water dives are the part you'll remember

Ask any diver about their certification and they will not tell you about a quiz or a regulator-clearing drill. They will tell you about the moment they descended through 5 metres of blue water for the first time and looked at a fish that ignored them. That happens on Open Water Dive 1.

The four open-water training dives are where everything you learned in theory and practised in the pool comes together in real conditions. They are also a rolling assessment, your instructor is signing off that you can apply the same skills outside the controlled pool environment. By the end of the fourth dive, you are a certified Open Water Diver, qualified to dive anywhere in the world to 18 metres without an instructor.

> **The big picture:** The pool taught you the mechanics. The four open-water dives prove you can do them when there's a current, a thermocline, and something interesting swimming past. They are not harder than the pool, but they are different.

## Contents

1. [What "open water" actually means](#what-it-is) 2. [Where Australian students do their open-water dives](#where) 3. [The day before, and the morning of](#day-of) 4. [Open Water Dive 1, your first ocean dive](#dive-1) 5. [Open Water Dive 2, emergency skills](#dive-2) 6. [Open Water Dive 3, navigation and buoyancy](#dive-3) 7. [Open Water Dive 4, the qualifying dive](#dive-4) 8. [What is different from the pool](#vs-pool) 9. [Common difficulties and how to handle them](#difficulties) 10. [Tips for getting the most from your open-water dives](#tips) 11. [What happens immediately after Dive 4](#after)

## What "open water" actually means {#what-it-is}

"Open water" is the certification-agency term for any dive site that is not a pool or sheltered confined-water area. In practice, it means the ocean, a lake, a flooded quarry, or occasionally a sheltered bay. Depths in the open-water training dives are deliberately limited:

- **Dives 1 and 2:** maximum depth 12 metres. - **Dives 3 and 4:** maximum depth 18 metres, the limit of an Open Water diver.

You will do four separate dives, each with its own briefing, skill set, and debrief. They are typically split across two days, two dives per day, with a one-hour surface interval between morning and afternoon dives.

## Where Australian students do their open-water dives {#where}

Australia is unusually well set up for open-water training because the water is warm, the visibility is generally good, and most major cities are within an hour of dive-able coast.

Common training-dive locations include:

- **Sydney:** [Shelly Beach (Manly)](https://www.scubadownunder.com/dive-sites), [Camp Cove](https://www.scubadownunder.com/dive-sites/camp-cove), Gordons Bay, [Bare Island](https://www.scubadownunder.com/dive-sites/bare-island). All are shore-entry sites with sheltered, sandy bottoms perfect for skill drills. - **Cairns / Port Douglas:** Most operators run two-day liveaboards to the outer reef, with dives 1–4 done across reef sites such as Norman Reef, Saxon Reef and Hastings Reef. This is the textbook tropical experience and the busiest training pipeline in Australia. - **Melbourne:** [Portsea Pier](https://www.scubadownunder.com/dive-sites/portsea-pier) and [Blairgowrie Pier](https://www.scubadownunder.com/dive-sites/blairgowrie-pier) on the Mornington Peninsula are the standard training sites, with sheltered piers acting as effective confined-style environments. - **Brisbane / Sunshine Coast:** Mooloolaba and the Sunshine Coast inshore reefs. - **Perth:** Rottnest Island and Mettams Pool. - **Adelaide:** [Rapid Bay Jetty](https://www.scubadownunder.com/dive-sites/rapid-bay-jetty) and Edithburgh.

You can browse the [full SDU dive-site directory](https://www.scubadownunder.com/dive-sites) to see depth, conditions, and skill level for each site.

> **Good to know:** Cairns liveaboard courses are popular because they bundle accommodation, food, and four dives on the Great Barrier Reef into one trip. The downside is intensity, four dives in 36 hours leaves little recovery time. Sydney and Melbourne courses spread the dives across weekends with rest in between.

## The day before, and the morning of {#day-of}

The night before your first ocean dive, two things matter: hydrate well, and sleep enough. Tired, dehydrated divers are more prone to mild decompression illness, equalisation problems, and seasickness. Skip the alcohol.

In the morning you'll typically:

1. **Arrive at the dive shop or boat ramp** an hour before the planned entry time. 2. **Sign in and complete the medical statement** if you haven't already, plus the agency's liability waiver. 3. **Be issued hire gear** that fits, mask (if you don't own your own, see [Gear You'll Use in Your Course](https://www.scubadownunder.com/blog/gear-youll-use-in-your-course)), wetsuit, BCD, regulator, weights and tank. 4. **Receive a site briefing** from your instructor, entry and exit points, depth, expected current, hazards, marine life you're likely to see, and the dive plan including planned skills. 5. **Conduct a buddy check** (BWRAF: BCD, Weights, Releases, Air, Final OK) with your dive buddy and instructor. 6. **Enter the water,** either via giant stride from a boat or pier, or by walking in from a beach.

A complete dive day from arrival to back at the car is usually six to eight hours, including the surface interval. It is more tiring than people expect.

## Open Water Dive 1, your first ocean dive {#dive-1}

Maximum depth: 12 metres. Typical duration: 25–35 minutes. The instructor's job on this dive is to get you comfortable in open water before asking you to demonstrate anything difficult.

**Skills typically performed:**

- **Controlled descent** down a line or the gentle slope of the bottom, equalising every metre. - **Regulator recovery and clearing,** retrieving a regulator that has come out of your mouth and clearing the water from it. - **Mask partial flood and clear,** the same skill as the pool, in salt water with a real horizon. - **Air-supply check,** practising signalling your remaining air to your buddy and instructor. - **Controlled ascent and safety stop,** ascending no faster than 9 metres per minute and pausing at 5 metres for three minutes.

What you'll actually notice in the moment: the salt taste in your regulator, the colour of the water at depth (warmer reds and oranges fade out by 5 metres), the sound of your own breathing, and how strange it feels to be upright at depth with marine life behaving as if you aren't there.

> **What surprises new divers most:** how casual the fish are. They have seen thousands of bubbling humans before you and consider you scenery.

## Open Water Dive 2, emergency skills {#dive-2}

Maximum depth: 12 metres. This is the dive where you practise responses to the things that "could" go wrong, in a controlled way so you would handle them if they ever did.

**Skills typically performed:**

- **Alternate Air Source (octopus) breathing,** locating and breathing from your buddy's secondary regulator while ascending together. The most important emergency skill in recreational diving. - **Controlled Emergency Swimming Ascent (CESA),** simulating an out-of-air ascent from depth. You exhale a continuous "aaah" sound the entire way up to keep your airway open. Done from no deeper than about 9 metres in training. - **Weight system removal and replacement at depth,** practical for adjusting kit underwater. - **Cramp release,** stretching your fin against your hand to relieve a calf cramp underwater. - **Tired-diver tow at the surface,** towing a buddy back to shore or boat using a fin push or BCD strap.

Almost every student finds CESA the strangest skill of the four dives. It feels counterintuitive to ascend without a regulator. Practising it in a controlled way is exactly why it's there, the muscle memory is what makes it work in a real emergency.

## Open Water Dive 3, navigation and buoyancy {#dive-3}

Maximum depth: 18 metres. This is where the depth limit moves to the full Open Water range, and where buoyancy and navigation become the focus.

**Skills typically performed:**

- **Compass navigation,** swimming a measured straight-line course on a heading, then a reciprocal heading back to your start point. This is the skill students underestimate and instructors take seriously, lost divers are a leading cause of diver incidents. - **No-mask swim and replacement,** swimming a short distance with no mask on at all, then putting it back on and clearing it. Less awful than it sounds, the regulator still works without the mask. - **Mid-water hover (fin-pivot or hover),** holding a position in mid-water using only breath control, no fin movement. The first taste of true neutral buoyancy. - **Air-management drill,** ending the dive with an agreed minimum tank pressure, typically 50 bar.

By Dive 3 most students are noticeably more comfortable in the water and are starting to look around rather than focus on instruments. Instructors deliberately give you slack here, less hand-holding, more independent positioning.

## Open Water Dive 4, the qualifying dive {#dive-4}

Maximum depth: 18 metres. This is the dive where your instructor effectively says, "show me you can do this." Skills are minimal and the dive feels closer to a real recreational dive than any of the previous three.

**What you'll typically do:**

- **Plan the dive** with your buddy under instructor guidance, choosing depth, route, time, and turnaround pressure. - **Execute the planned navigation,** often a square pattern or a there-and-back leg using compass and natural references. - **Complete a final mid-water hover** demonstrating you can stop, hold position, and resume swimming without crashing into the bottom. - **Otherwise dive the site,** observing marine life, taking in the scenery, and proving by your behaviour that you have absorbed the previous three dives.

The dive ends with a slow ascent, a three-minute safety stop at 5 metres, and an exit. On the boat or beach your instructor signs your training record as complete.

## What is different from the pool {#vs-pool}

The skills are the same. Five things change:

1. **Visibility is variable.** Sydney winter visibility can drop to 3–4 metres. Cairns reef visibility is often 25 metres+. Plan for the lower end. 2. **You are colder.** A 5 mm wetsuit is fine for a 60-minute pool session and marginal for a 35-minute Sydney winter dive. Multi-dive days compound the cold. 3. **There is current and surge.** Even a gentle 0.2 knot current asks more of your finning than the pool. Surge near the surface in shallow sites can rock you sideways unexpectedly. 4. **Equalisation is harder when you're cold or congested.** A blocked sinus that's tolerable on land becomes a hard stop at 4 metres. Don't dive with a head cold. 5. **There are things to look at.** Distraction is the single biggest difference. Maintain awareness of your air, depth, and buddy even when there's a turtle going past.

## Common difficulties and how to handle them {#difficulties}

- **Mild seasickness on the boat.** Sit outside facing the horizon, take a non-drowsy travel-sickness tablet 30 minutes before departure, eat a light bland breakfast. Most students who get queasy on the way out feel fine the moment they're underwater. - **Trouble equalising.** Descend slowly, pause every metre, equalise gently *before* you feel pressure rather than after. If one ear won't clear, ascend a metre, swallow, try again. Never force it. - **Cold during a long surface interval.** Get out of the wet wetsuit between dives, dry off, and put on a windbreaker. Hot drink helps. Shivering between dives is your body trying to tell you something. - **Buoyancy still feels rough.** Completely normal on Dives 1 and 2. By Dive 4 it improves noticeably, and by your fiftieth dive it's automatic. Buoyancy is a slow-cook skill, not a one-day skill. - **Anxiety on the descent.** Hold the descent line, look at your buddy, breathe slowly. Tell your instructor before the dive that this happens, they will pace the descent for you.

## Tips for getting the most from your open-water dives {#tips}

- **Own your mask, snorkel and boots before you turn up.** A leaking hire mask can ruin Dive 1. See [Gear You'll Use in Your Course](https://www.scubadownunder.com/blog/gear-youll-use-in-your-course) for what's worth buying first. - **Brief and debrief actively.** Ask questions during the briefing if anything is unclear. After each dive, discuss what went well and what didn't with your instructor while it's fresh. - **Slow your finning.** Most new divers kick too hard and burn through air. Long, lazy kicks. You are not racing. - **Watch your air every two minutes.** Until checking your SPG becomes a habit, set a deliberate routine. - **Take a logbook.** Most operators issue you one at the start of the course. Fill out each dive immediately afterwards, depth, time, conditions, marine life. You will reread it for years. - **Eat between dives.** A sandwich and water on the surface interval prevents the energy crash that makes Dive 2 of the day feel harder than Dive 1. - **Keep a positive attitude with your instructor.** They are deciding whether to certify you. Engaged, calm students who ask good questions get more attention and more time on skills they're struggling with.

## What happens immediately after Dive 4 {#after}

Once your instructor signs your training record, your certification is processed by the agency (PADI, SSI, NAUI, or whichever school you went with). You'll typically receive a temporary digital certification card by email within 24–48 hours and a plastic card in the post within a few weeks.

You are now an Open Water Diver, qualified to:

- Dive to 18 metres anywhere in the world. - Hire equipment and tank fills from any dive shop on production of your card. - Dive without an instructor present, with a similarly-or-better-qualified buddy. - Continue your education with [Advanced Open Water](https://www.scubadownunder.com/learn-to-dive), [Rescue Diver](https://www.scubadownunder.com/learn-to-dive), and beyond.

> **First post-cert dive:** Most agencies recommend your first dive after certification be with a guide or buddy with significant experience, ideally on a familiar site. The skills you have are real but new, and they consolidate fastest with one or two experienced dives before going off independently.

## Next steps

- Read [What to Expect in the Theory Module (Knowledge Development)](https://www.scubadownunder.com/blog/what-to-expect-in-your-theory-module-knowledge-development) so the academic side of your course feels less mysterious. - Revisit [What to Expect in Your Pool Sessions](https://www.scubadownunder.com/blog/what-to-expect-in-your-pool-sessions-confined-water-training) for the skill drills that lead into Dives 1 and 2. - Browse the [SDU dive-site directory](https://www.scubadownunder.com/dive-sites) to see exactly where Australian schools take students for the four open-water dives, and what each site is like.