The debrief narrates one completed dive against the plan it was meant to follow. It is written on request at the end of a post-dive review, from the button Debrief this dive with AI: one answer, no follow-up, nothing kept. It calculates nothing. Everything it says comes from the review you just completed.
What drove this reading, and what to change next dive.
A few factors added decompression stress on this dive. The notes below are where the margin is.
- Cold during decompressionstrong
- Warm on the bottomstrong
- Hydrationmoderate
- Exertion at depthstrong
- Sleep & fatigueweak
Off-gassing is faster when you are warm during deco — being cold on the stops meaningfully raises risk.
Cold during decompressionBeing warm at depth increases inert-gas uptake — the NEDU rule is "cool on the bottom, warm on the ascent."
Warm on the bottomSensible hydration supports inert-gas washout — but over-hydration has its own risks, so aim for normal, not excess.
HydrationExertion at depth is DAN’s top-listed risk factor — heavy work raises perfusion and inert-gas uptake.
Exertion at depthFatigue is a recognised predisposing factor and also mimics DCS — start rested.
Sleep & fatigue
This review is for education and dive-planning reflection only. It is not a medical device and does not diagnose, treat, or rule out decompression sickness. If you feel unwell after diving, seek advice from a physician trained in dive medicine.
What it is given
- The plan: name, open or closed circuit, planned maximum depth and runtime.
- Plan against actual: adherence score out of 100, maximum depth, time to reach depth, mean depth deviation, time spent on the planned depth, runtime and peak ascent rate.
- Stops: every stop, planned and actual minutes side by side.
- Differences: each one found, with how serious it is.
- Your own answers: decompression-stress band and score, and the top three contributing factors.
- Symptoms: any symptom you reported, with how long after surfacing it began.
The band, the score and the contributors are the review’s own reading of your answers, worked out before Tunang is asked anything. Nothing else about you reaches it: no dive history beyond this dive, no other reviews, no account detail.
How it reads
Plain prose in short paragraphs, no headings, no list longer than three items, facts with their numbers (“you reached 40 m about 2 minutes after the plan expected”), and under roughly 250 words: what happened against the plan, what most likely caused each difference, and two or three adjustments for next time.
Its limits
It is not a medical device. It is forbidden from diagnosing decompression sickness or ruling it out. Neither a clean adherence score nor a low stress band may be described as making DCS impossible, because neither does.
A reported symptom changes the first sentence. If you reported any symptom, the debrief opens by acknowledging it and directing you to the guidance the app gives: breathe 100 % oxygen if available, and contact DAN (+1-919-684-9111) or a dive physician, even if the symptom seems mild or is fading.
It reads the evidence, it does not add to it. Where more than one explanation fits, it must say so and take the conservative reading. It is forbidden from inventing anything it was not given.
It is one opinion about one dive. It is not a clearance to repeat the profile, and where it matters the next conversation is with your instructor or a dive physician.
Next
- Plan adherence is the comparison it narrates.
- A debrief counts against the usage allowance.