Open Water Course: What to Expect Hour by Hour

If you've signed up for your Open Water course and the nerves are starting to creep in, breathe out. I've taught this course more than 200 times and the pattern is identical: confused at hour one, comfortable by hour eight, properly diving by hour twenty. Here's exactly what happens, hour by hour, so nothing on the boat surprises you.

Before You Arrive

Most schools now run theory online. You'll spend 6-10 hours watching short videos, completing 5 chapter quizzes and taking a final 50-question multiple-choice exam. Pass mark is 75% but every question you miss is reviewed with the instructor — there's no fail-and-go-home pressure.

Pack: swimwear, toiletries, reef-safe sunscreen, a refillable water bottle, sea-sickness tablets if you're prone, and a small notebook. Most schools provide everything else from mask to BCD. If you've bought your own mask and fins, bring them.

Day 1 — Theory Wrap-Up and Pool

Hour 1: Paperwork and Medical

You'll sign a liability waiver, hand over emergency contacts and medical questionnaire, and be issued your student kit. The instructor will go over the day's plan and answer any panic questions ("Will I see sharks?" comes up every single course).

Hours 2-3: Theory Review

The instructor walks through the topics where students most often miss exam questions — pressure-volume, no-decompression limits, ascent rates. If you've done eLearning, this is the part where everything finally clicks.

Hours 4-5: Equipment Setup and Pool Entry

You'll learn to assemble a complete kit: tank to BCD, BCD to regulator, regulator to mouthpiece. The instructor will walk through it twice, then have you do it solo. By the third assembly it's automatic.

Then: pool. The first underwater breath is the strangest moment of the course. You'll fight the urge to surface for about 30 seconds. Then your body realises it can stay down, and the panic evaporates.

Hours 6-7: Confined Water Dive 1

• Equalisation drill on descent
• Regulator clear and recovery
• Mask flooding and clearing
• Out-of-air signal and switch to alternate
• Five-point ascent

You will swallow some pool water. Everyone does. Laugh and move on.

Day 2 — Pool Skills + Theory Exam

Hours 8-10: Confined Water Dives 2 and 3

Skills get harder and more essential:

• Mask removal underwater (the one everyone fears)
• Buoyancy fin pivot — first taste of neutral hovering
• Tired diver tow on the surface
• Cramp removal
• Controlled emergency swimming ascent (CESA) on a single breath from 6m

Mask removal takes about three minutes of staring at the bottom of the pool talking yourself into it. Once you do it once, it's no longer scary. Promise.

Hour 11: Theory Exam

50 multiple choice questions, 75% to pass. Average completion time: 20 minutes. Failing rates are below 2% and any missed questions are reviewed and re-answered until correct.

Hours 12-13: Confined Water Dives 4 and 5 + Buddy Check Drill

Final pool day. You'll rehearse the BWRAF pre-dive safety check until it becomes muscle memory:

• BCD — inflate and deflate works
• Weights — clear, accessible, correct amount
• Releases — all 5 known and reachable
• Air — both regs work, tank is on, pressure is correct
• Final OK — mask, fins, computer all set

Day 3 — Open Water Dives 1 and 2

Hour 14: Boat Briefing

Site briefing, current direction, max depth, signals to the boat, lost-buddy procedure. Pay attention — the instructor will ask you to recite key points before geared up.

Hour 15: Open Water Dive 1

Maximum 12m. You'll redo the most important pool skills underwater (regulator recovery, mask clearing, alternate air) then swim slowly behind the instructor for 20 minutes of fun-time. Almost everyone is awestruck. A few are too distracted by gear to notice the reef. By dive two that flips.

Hour 16: Surface Interval

An hour at minimum on a boat or beach. Hydrate, snack, debrief. Don't sit in the sun — fatigue and dehydration are nitrogen's best friends.

Hour 17: Open Water Dive 2

Same depth limit. More skills, more diving. By the end of this dive you'll be using your BCD with rare touches — meaning you're starting to control depth with your lungs alone.

Day 4 — Open Water Dives 3 and 4

Hour 18: Open Water Dive 3

Depth bumps up to 18m — your final certified depth. You'll complete a navigation drill (swim 30 fin-kicks on a heading, turn 180° and return). The deep colours start to wash out around 12m, which is the moment the instructor will hand you a torch and let you flick it on a sponge. The colours pop back. Magic.

Hour 19: Surface Interval

Same as before. Eat, drink, log dive 3 in your logbook.

Hour 20: Open Water Dive 4

The final dive is more "fun dive" than skill drill. You'll do a buddy-led tour around the reef with the instructor watching. They'll signal corrections rather than direct. By surface time, you're a certified diver.

What's Inside Your Logbook

For each of the four dives, record:

• Date, location, dive site name
• Maximum depth
• Total bottom time
• Air-in / air-out (bar or psi)
• Water temperature, visibility
• Conditions (current, surge)
• Buddy name + instructor signature
• Notes — what you saw, what you struggled with

Common Day-Specific Worries

Day 1: "I can't breathe through this thing properly"

Normal. Your brain is fighting the wet face + water-noise combo. Slow your inhale to a four-second count and exhale to six. Within the first 10 minutes the panic loop quiets.

Day 2: "Mask removal is impossible"

Just as normal. Hold the mask in place but break the seal and let water in. Replace, exhale through your nose to clear. Do it three times in shallow water, then the deep version is straightforward.

Day 3: "My ears won't equalise"

Stop descending. Go up half a metre. Try again. If it still won't go, abort and try the next dive. Forcing equalisation breaks ear drums. Patience is everything.

Day 4: "Am I really ready to dive without my instructor?"

Yes. But don't go straight to a 25m wall dive. For your first 20 post-cert dives, stay in the same depth range you trained at, keep buddies experienced, and book operators with attentive guides.

How to Maximise the Course

• Eat lightly the night before. Hangovers and breakfast burritos do not mix with surface intervals.
• Sleep well. Fatigue increases panic responses underwater.
• Be early. Showing up rushed sets a stress tone for the day.
• Ask. Every. Question. Instructors prefer students who voice fears.
• Treat the boat crew well. They're invisible safety net #2.

What Happens After Certification

You'll receive a temporary digital card immediately, a plastic card 4-6 weeks later, and access to the agency's app to log dives going forward. Most schools offer a discount on a 2-tank fun dive the following day — take it. Diving without skills pressure is the moment Open Water graduates fall in love with the sport.

Frequently Asked Questions

Can I do the Open Water course solo or do I need a buddy?

Solo is fine. Most students sign up alone and get paired with another student or the instructor for buddy work.

What if I can't complete a skill on the day?

Reputable schools schedule extra session time. You'll repeat the skill at no additional cost until you nail it.

Will I see big marine life on my training dives?

Often, yes. Turtles, reef sharks, octopus and eagle rays show up regularly on Open Water sites in tropical destinations. The instructor won't pursue them but won't ignore them either.

What if conditions are too rough on a training day?

The instructor will reschedule. Open Water training is never run in dangerous seas. Add a buffer day to your trip in case of weather.

How tired will I be?

Properly tired. Diving is exertion plus sun plus stress. Plan to nap or sit quietly each evening, eat well, hydrate hard. Avoid alcohol — it dehydrates you and increases nitrogen retention.