Gas pressure is not dive time
A full gauge says how much gas is present, not how long it will last at depth.
Safety and training
General field notes, not a dive plan. Stay within your training, follow local site rules and the operator’s briefing.
Field observation
Consumption rises with ambient pressure and effort. Compare starting pressure, agreed turn pressure and reserve throughout the dive; a companion's rate may be very different from yours.
A practical approach
Turn at the first agreed limit, monitor both divers and end early if a leak or unusual breathing changes the calculation.
Dive-day checklist
Before you go
- Check local conditions and access rules
- Agree limits and the exit with your buddy
- Stop or change the plan if conditions differ
General guidance only. Follow your training, the dive operator’s procedures, and each manufacturer’s current instructions.
Ask the dive guide
Personal guidance for your next dive
Describe a dive scenario or an equipment-care question. The guide answers in your language and points you to relevant journal articles.
General educational guidance only. It is not medical advice, emergency instruction or a replacement for training, certification, manufacturer instructions, your operator's briefing or your dive plan.