Safety Stops in Scuba Diving: What They Are and When to Make One

A scuba safety stop is a planned pause in shallow water near the end of a recreational dive. It adds conservatism to a controlled ascent, but it is not the same as a required decompression stop and it cannot make a dive risk-free. The exact stop shown for your dive must come from your training, dive plan, computer and local briefing.

What is a safety stop in scuba diving?

A safety stop is an additional shallow pause made during the final part of an otherwise no-stop recreational dive. Divers are commonly taught a stop around 5 m (15 ft), often for three minutes or longer, but that familiar example is not a universal instruction for every dive. Follow the procedure you were trained to use and the information displayed by the computer or table used for the actual plan.

The stop is one part of an ascent, not a substitute for the rest of it. Good buoyancy, a controlled ascent rate, adequate gas, buddy awareness and a sensible profile all matter. Divers Alert Network (DAN) notes that the greatest relative pressure change occurs in the shallowest part of the ascent, which is why shallow-water control deserves attention.

Safety stops, decompression stops and deep stops are different

The distinction matters. DAN's review of deep stops says there is insufficient evidence to justify inserting an arbitrary deep stop into every recreational no-decompression ascent. Adding an unplanned stop can also use gas and time needed elsewhere. Follow the selected computer or planning method rather than mixing rules from different systems.

Why does the shallow part of an ascent matter?

Pressure changes throughout an ascent, but the proportional change is greatest close to the surface. A controlled shallow pause gives the diver time to stabilise, monitor the team and continue the final ascent deliberately. It also creates a useful buffer after a sensibly planned recreational profile.

This does not mean that completing a safety stop prevents decompression sickness. DCS can occur after dives that remain within recognised limits, and susceptibility varies between people and dives. The better message is that a safety stop can contribute to a more conservative ascent; it is not an insurance policy against every outcome.

Plan the stop before entering the water

The easiest safety stop is the one considered before the descent. Agree the ascent procedure during the briefing and confirm how it fits the site, the boat operation and the team's equipment.

• Confirm the maximum depth, planned route, turn pressure and ascent procedure.
• Know which computer or table governs the plan and check that the computer is configured for the actual breathing gas.
• Discuss the depth reference: an ascent line, reef contour or open-water stop using the method covered in your training.
• Plan enough gas for the ascent, stop and a sensible reserve; a safety stop should not depend on reaching the shallow water with almost no gas.
• Agree how the buddy team will respond to separation, current, surge, low gas or a lost ascent reference.

How do you hold a controlled safety stop?

Use the skills practised in training rather than trying to follow a new underwater procedure from memory. Begin the ascent at the planned point, monitor the computer and vent expanding gas from the BCD or drysuit as required. Approach the indicated stop depth without rushing past it, then stabilise with normal breathing and small, deliberate adjustments.

Remain aware of your buddy, cylinder pressure, depth and surroundings. An ascent line can provide a helpful visual or tactile reference, but avoid pulling on other divers or allowing the team to bunch together. In open water, use the reference and signalling procedure covered in the briefing and within your training. Continue to breathe normally; never hold your breath during an ascent.

When the applicable stop is complete, make the final ascent at the controlled rate required by the plan and computer. The last few metres still matter. Stay alert for boats, lines, surge and other divers rather than treating the stop's completion as the end of the dive.

What if current, surge or gas changes the plan?

South African sea dives can combine surge, current, swell and active boat traffic. These conditions can make a shallow depth harder to hold than a pool demonstration suggests. Discuss the operator's ascent-line, delayed surface marker buoy and pickup procedures before the dive, and use only methods for which the team is trained.

If conditions or equipment make the original plan difficult, remain with your buddy and use the trained alternative from the briefing. Do not turn a problem into a second emergency by chasing an exact depth while losing control of buoyancy, separation or gas. A required decompression obligation is a different situation from an optional recreational safety stop and needs the specific procedure supplied by the diver's training and planning system.

What if a stop is interrupted or missed?

There is no single online rule that safely covers every missed or interrupted stop. The correct response depends on whether the dive remained within no-stop limits, what the computer displays, the profile, the breathing gas, the reason for surfacing and the diver's training. Follow the computer manual, training and operator emergency procedure, and tell the dive leader exactly what happened.

Do not improvise a return to depth or attempt in-water recompression. DAN's case material on interrupted mandatory decompression shows why an omitted obligation is a serious event and why ad-hoc re-descent is not a generic solution. If the stop was required, the profile was abnormal or there is any concern, end the diving and seek qualified advice.

When should a diver seek medical help?

Do not rely on a completed safety stop to dismiss symptoms after diving. Unusual fatigue, persistent pain, dizziness, numbness or tingling, weakness, confusion, breathing difficulty, an unusual rash, balance problems or collapse can be signs of decompression illness or another serious condition.

Stop diving, activate local emergency medical services for a serious or life-threatening problem, and provide emergency oxygen if it is available and you are trained to administer it. Keep the diver out of the water and obtain a medical assessment even if symptoms improve. After local emergency services have been contacted, DAN Southern Africa provides 24-hour diving-emergency assistance on +27 82 810 6010.

A practical pre-dive safety-stop checklist

1. Is this dive planned within the limits of my qualification and recent experience?
2. Which computer or table governs the plan, and is it configured correctly?
3. What stop and final-ascent procedure does the briefing require?
4. How will we control depth in the expected current, surge and visibility?
5. What gas reserve and buddy response have we agreed?
6. What are the site's emergency contacts, oxygen arrangements and pickup procedure?

If any answer is unclear, resolve it with the dive leader or a qualified instructor before entering the water. A buoyancy refresher or supervised skills session is more useful than trying to learn an ascent procedure from a blog post.

Related guidance and reviewed sources

Continue with our Dive Techniques guides for related buoyancy and dive-planning topics. Any course or refresher booking link should be added only after the course owner confirms the current destination and suitability.

• Divers Alert Network: Defensive Dive Profile Planning
• Divers Alert Network: Ascent Rates
• Divers Alert Network: Deep Stops
• Divers Alert Network: Interrupted Decompression Leads to Decompression Sickness
• DAN Southern Africa: Medical Resources and Emergency Hotline
• PADI: Standard Safe Diving Practices

Editorial status: source-checked on 26 August 2026. Final operational and medical wording still requires named qualified dive-training and dive-medicine review before publication.