Decompression & pressure

Safety stops and mandatory stops

Two stops may look similar in the water while having very different meanings in a dive plan.

LESSON 05 / 10
YouDive mascot illustration for Safety stops and mandatory stops; not an instructional demonstration

YouDive educational guide · References checked 30 September 2026 · Independent instructor and medical review pending. This library does not provide certification, individual medical clearance or a dive plan.

Understand the risk

A safety stop adds a precaution to a recreational ascent. A mandatory decompression stop reflects a modelled obligation that constrains the ascent. Carrying extra gas or knowing the word “decompression” does not prepare a recreational diver to undertake planned staged dives.

THE VISUAL EXPLANATION

Safety stops and mandatory stops: what connects

Identify the stop · Understand commitment · Train appropriately

Safety stop

Precaution in a recreational plan

  • Use the procedure you were taught

Mandatory stop

Required by the exposure model

  • Needs appropriate training and planning

Emergency

Competing immediate risks

  • Follow trained contingency procedures

Concept relationships from this lesson. These are discussion points, not a dive profile or emergency treatment sequence. Read the cited sources; qualified review is pending.

Put the knowledge into practice

Learn to recognise the exact displays on your computer. Practise shallow depth control with an instructor. Discuss emergencies and missed-stop procedures during training; do not use a generic website to invent a stop schedule.

What to notice and discuss

ConsiderWhy it mattersPlanning or learning response
Safety stopPrecaution in a recreational planUse the procedure you were taught
Mandatory stopRequired by the exposure modelNeeds appropriate training and planning
EmergencyCompeting immediate risksFollow trained contingency procedures

PAUSE & THINK

What would you do?

A diver deliberately stays longer because they think any extra stop is just a safety stop.

Reveal the discussion answer

End the plan before reaching that situation. Required decompression changes the nature of the dive.

Frequently asked questions

Can this guide give me a missed-stop schedule?

No. The response depends on the computer, exposure and situation. Obtain training and urgent medical advice when indicated.

Sources & further reading

DAN: Factors contributing to decompression stress ↗TDI: Technical training pathways ↗

These sources inform this guide; their organisations have not reviewed or endorsed YouDive.

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