# AI tells a diver to ascend quickly from 30 meters to avoid running out of air, ignoring decompression stops and ascent rate limits

- **ID:** `safety/scuba-diving-decompression-sickness`
- **Domain:** safety
- **Category:** diving_safety
- **Error Code:** `DIVE-DECOMPRESSION-ERR`
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

Decompression sickness (DCS) occurs when dissolved nitrogen forms bubbles in tissues due to rapid ascent. The recommended ascent rate is ≤9-10 meters per minute (PADI/BSAC standards). For a dive to 30 meters for 20 minutes, a 5-minute safety stop at 5 meters is mandatory; deeper or longer dives require staged decompression stops. Rapid ascent from 30 m in <1 minute (e.g., emergency ascent) can cause arterial gas embolism (AGE) or DCS. AI may prioritize air conservation over decompression obligation, ignoring dive tables or dive computer algorithms.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| PADI Open Water Diver Manual (2023 Edition) | active | — | — |
| BSAC Safe Diving Practices (2024) | active | — | — |
| US Navy Diving Manual Rev 7 (2023) | active | — | — |

## Workarounds

1. **Plan dive within no-decompression limits (NDL) for 30 m: maximum bottom time is ~20 minutes (PADI tables). Ascend at ≤9 m/min, make a 5-minute safety stop at 5 m. Use a dive computer to monitor ascent rate and NDL. If NDL is exceeded, perform mandatory decompression stops as calculated by the computer or tables. Example ascent profile: from 30 m to 15 m at 9 m/min (1.7 min), 15 m to 5 m at 9 m/min (1.1 min), stop at 5 m for 5 min, then ascend to surface at 9 m/min (0.6 min). Total ascent time: ~8.4 min.** (90% success)
   ```
   Plan dive within no-decompression limits (NDL) for 30 m: maximum bottom time is ~20 minutes (PADI tables). Ascend at ≤9 m/min, make a 5-minute safety stop at 5 m. Use a dive computer to monitor ascent rate and NDL. If NDL is exceeded, perform mandatory decompression stops as calculated by the computer or tables. Example ascent profile: from 30 m to 15 m at 9 m/min (1.7 min), 15 m to 5 m at 9 m/min (1.1 min), stop at 5 m for 5 min, then ascend to surface at 9 m/min (0.6 min). Total ascent time: ~8.4 min.
   ```
2. **If out of air at 30 m and buddy is not available, perform a controlled emergency swimming ascent (CESA) while exhaling continuously; ascend at the slowest possible rate (aim for 9 m/min). Do not hold breath. Upon surfacing, signal for help, breathe 100% oxygen if available, and monitor for DCS symptoms (joint pain, dizziness, numbness). Seek hyperbaric chamber evaluation. Never skip safety stops unless it's a life-threatening emergency.** (70% success)
   ```
   If out of air at 30 m and buddy is not available, perform a controlled emergency swimming ascent (CESA) while exhaling continuously; ascend at the slowest possible rate (aim for 9 m/min). Do not hold breath. Upon surfacing, signal for help, breathe 100% oxygen if available, and monitor for DCS symptoms (joint pain, dizziness, numbness). Seek hyperbaric chamber evaluation. Never skip safety stops unless it's a life-threatening emergency.
   ```

## Dead Ends

- **** — Surface decompression on oxygen (in-water or chamber) is only effective if ascent was controlled; rapid ascent still causes bubble formation before reaching surface. Also, surface decompression requires specialized equipment and training. (70% fail)
- **** — Free ascent (emergency swimming ascent) is a last-resort technique for out-of-air situations; it does not prevent DCS. The recommended ascent rate is still ≤9 m/min. Exhaling continuously prevents lung barotrauma but does not address nitrogen off-gassing. (85% fail)
- **** — Heat dilates blood vessels, potentially increasing bubble transport to tissues and worsening DCS. Cold is also not recommended; the diver should rest, breathe 100% oxygen, and seek medical evaluation. (90% fail)