Safety stop (5 m / 3 minutes)

A safety stop is a short pause you make before reaching the surface to help your body release nitrogen. Most divers perform this at 5 m for 3 minutes after every dive.

How it works in practice

You stay at a specific depth to manage gas. This pause slows down the ascent because it allows nitrogen to leave your tissues gradually. While you wait, your computer tracks your nitrogen levels and ensures you stay within safe limits.

The process is simple. You descend to 5 m after your ascent from deeper water. Most recreational dives in places like Cebu involve depths of 18 m to 24 m. You must remain at this depth for at least 3 minutes.

Don’t rush the clock. If you ascend too fast, the pressure drops before the nitrogen can exit safely. I have seen divers struggle with buoyancy during these stops. Use your BCD to stay steady.

Why it matters for safety

Safety stops reduce your risk of decompression sickness. This condition happens when nitrogen bubbles form in your blood or tissues. Even if you feel fine, your body needs this time to stabilize.

The math is quite strict. A rapid ascent from 30 m can cause a massive pressure change. You want to avoid the 10% increase in risk that occurs when skipping these pauses.

I remember diving in Tubbataha in 2017. The deep walls meant we often hit 30 m or deeper. We always prioritized that 5 m hold because the nitrogen load was high.

It is a vital habit. Skipping it might save two minutes of time. However, the medical cost of a mistake is far too high.

Common mistakes in the field

Beginners often skip this step in Koh Tao. I saw many students rush toward the boat back in 2014. They often rush because they want to get to the surface quickly.

Strong currents make stops difficult. You might find yourself fighting a heavy surge at 5 m. If the current is strong, hold onto a mooring line or a rock. Do not let the surge pull you toward the surface before your time ends.

Watch your buoyancy carefully. Many divers lose control and float up too early. This mistake increases your risk of decompression sickness significantly.

Stay calm and breathe steadily while you wait. If you feel panicked, focus on your regulator.

Connection to ascent rates

The safety stop is part of a controlled ascent. You should never exceed an ascent rate of 9 m per minute. This speed keeps the pressure change manageable for your lungs and blood.

This concept links directly to your dive computer. Your device calculates the exact nitrogen load based on your depth and time. It tells you if you need a longer stop or if you have reached a decompression limit.

Always check your computer for the exact depth requirements. It is your most important tool during the final minutes of a dive.

Check your computer settings before your first dive of the day.