Returning to Diving After a Long Break: Refresher, Medical and Gear

Do you need a scuba refresher course after a long break?

After a year or more without diving, yes. After six months, it depends on how many dives you had before the gap. DAN's return-to-diving guidance says skills degrade somewhat after as little as six months of inactivity, and that most dive educators consider one to two years enough to warrant refresher training. For a long hiatus, DAN recommends a formal review of both knowledge and in-water skills.

Agencies draw similar lines. A PADI article on the signs you need a refresher says some dive shops will suggest one after six months, especially if you have fewer than 20 lifetime dives, while a diver with a long logged history may not need one unless it has been a year or more. NAUI's standard for its Refresher Scuba course is firmer: anyone with no diving in the previous 12 months must pass a water skill evaluation, with confined water training as needed, before any open water activity.

In practice the dive centre decides, and it can ask for more than your card shows. PADI states that its certifications never expire, then adds that dive shops like to see a recent ReActivated date on the card. Our training guides cover what each certification level allows once you are back in the water.

PADI ReActivate, SSI Scuba Skills Update and other refresher programs

They share one structure: a knowledge review, then a supervised session in a pool or calm confined water. The differences are how much of it happens online and what record you walk away with.

PADI's in-water session is optional, so the eLearning on its own refreshes knowledge, not skills, and the new card needs both parts. If the gap left you unsure about assembling gear or holding buoyancy, book the pool session. SSI suggests taking its update just before a dive holiday.

Which diving skills fade first?

No study has followed certified divers through a break and recorded which skill goes first. The answer has to come from two indirect sources: research on skill decay in general, and the incidents divers report.

The best-known review of skill decay, a 1998 meta-analysis by Arthur and colleagues covering 189 data points from 53 articles, found substantial loss with non-use. The effect size was -0.01 immediately after training and -1.4 after more than 365 days without practice. Physical tasks held up better than cognitive ones. The authors did not study diving, but the pattern points at the thinking side of it: the order of steps in an out-of-air response, your computer's menus, working out gas. Finning is the kind of physical skill that tends to last.

Incident reports point at buoyancy and ascents. In the 500 reports DAN reviewed for its 2019 annual report, the most common incident types were rapid ascents (15%), running out of gas (8%), loss of buoyancy control (5%) and starting a dive with the cylinder valve not fully open (2%). BSAC's return-to-diving advice names buoyancy control and DSMB deployment as skills often implicated in incidents. It adds that a newly qualified diver back from six months off may need a lot of practice, while an experienced dive leader may need only minutes.

DAN's list of skills to practise in confined water before open water covers most of these. On the knowledge side it adds dive planning and the use of tables and computers.

• Pre-dive checks
• Buoyancy check and weighting
• Mask clearing, removal and replacement
• Regulator recovery and clearing
• Shared-air ascent
• Emergency swimming ascent or controlled emergency swimming ascent

When should you see a doctor before diving again?

When the diver medical questionnaire says so, or when illness is what kept you out of the water. The current form, version 2026-01-01 from the Diver Medical Screen Committee working with UHMS, DAN and DAN Europe, has 10 questions. A yes to question 3, 5 or 10, or to any item in the boxes on page 2, means a physician's evaluation is required. The form is designed mainly for new divers but says it suits anyone considering any diving activity, and a long break is when the answers are most likely to change. These are the ones to reread:

• Age. Question 2 asks if you are over 45. That alone is not a referral: it sends you to box B, which asks about smoking or other nicotine use, high cholesterol, high blood pressure, and a close relative who died suddenly or of heart disease or stroke before 50. A yes there means a doctor.
• Fitness. Question 3 asks whether you struggle to walk 1.6 km (1 mile) in 14 minutes or swim 200 m without resting, or could not take part in normal physical activity in the past 12 months.
• Surgery. Question 5 covers any surgery in the last 12 months and ongoing problems from older surgery.
• Medication. Question 10 covers any current prescription drug, except birth control, menopausal hormone replacement and antimalarials other than mefloquine.

Illness, new medication and age: what DAN adds

DAN adds its own triggers. If illness kept you away, you have certain risk factors, or you are over 65, it says self-evaluation is not enough. For a new prescription, DAN recommends 30 days on land for most drugs, to confirm the dose and reveal side effects, and notes that the condition being treated is more likely to rule you out than the drug. If a drug carries a warning about alcohol or operating machinery, consider its interaction with narcosis before diving deeper than 24 m (80 ft).

DAN also scales its return-to-diving advice by age, as in the table below. Our article on how dangerous scuba diving is covers the part heart problems play in diving deaths.

Checking gear that has been in storage

Treat service intervals as calendar dates, because several of them are. Scubapro's regulator manual calls for an overhaul by an authorised technician every 2 years, so a regulator that sat in a cupboard through a three-year break is due whether or not it was used. DAN's advice for returning divers is to service the BC at least annually, or before you resume diving after time away.

Cylinders carry dates that fill stations check. In the US, DAN explains, 49 CFR 180.209 sets a five-year requalification for scuba cylinders, the CGA's publication P-5 lists an annual visual inspection, and fill stations must require a current test before filling. In the UK, BSAC describes a hydraulic test every five years with a visual inspection due about 2.5 years after it.

Re-read the dive computer manual before the trip. Settings you chose years ago, such as the gas mix, conservatism or units, are still stored, and the menus will be less familiar than they were. PADI's refresher checklist also says to check the computer's battery.

How to plan your first dive back

Make it shallow, familiar and easy, with a professional nearby. DAN recommends not diving solo, considering a divemaster or instructor, and picking a familiar, shallow site with minimal current and no major hazards, not a remote one. BSAC suggests straightforward shallow dives first, building steadily back to your previous level, avoiding spring tides on your first sea dives and expecting the water to be colder than you remember.

The first day of a trip deserves the most care. In DAN's 2019 incident review, around half of the incidents happened on the diver's first visit to the site, often on the first day of a dive series. The authors caution that this may partly reflect when divers are most likely to report an incident, and conclude that pre-dive checks and close attention to remaining gas could prevent many of them.

• Book the refresher or a checkout dive for day one, before any boat or current dives.
• Do a weight check at the end of the dive, because your body, suit and cylinder may all have changed. Our weighting guide explains how.
• Agree hand signals and the out-of-air plan with your buddy on the surface, especially with someone you have not dived with before.
• Check the computer's gas and conservatism settings before you get in.
• Look at your pressure gauge more often than you used to.
• Log the dive, so the next dive centre can see a recent entry. Our guide on how to log a dive lists what to record.