{
  "id": "safety/scuba-diving-decompression-sickness",
  "signature": "AI tells a diver to ascend quickly from 30 meters to avoid running out of air, ignoring decompression stops and ascent rate limits",
  "signature_zh": "AI 告诉潜水员从30米快速上升以避免空气耗尽，忽略减压停留和上升速率限制",
  "regex": "(?i)(?:ascend.*(?:quickly|fast|rapid).*(?:30|40|50).*(?:meter|m|feet|ft).*(?:dive|scuba|air|decompression))|(?:skip.*(?:decompression|safety).*stop)|(?:no.*(?:deco|decompression).*stop.*(?:30|40|50).*m)",
  "domain": "safety",
  "category": "diving_safety",
  "subcategory": null,
  "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.",
  "root_cause_type": "generic",
  "root_cause_zh": "减压病（DCS）是由于上升过快导致溶解的氮气在组织中形成气泡。建议上升速率为≤9-10米/分钟（PADI/BSAC标准）。对于30米深度20分钟的潜水，必须在5米处进行5分钟安全停留；更深或更长的潜水需要分级减压停留。从30米快速上升（例如紧急上升）在<1分钟内可能导致动脉气体栓塞（AGE）或DCS。AI可能优先考虑空气节省而非减压义务，忽略潜水表或潜水电脑算法。",
  "versions": [
    {
      "version": "PADI Open Water Diver Manual (2023 Edition)",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "BSAC Safe Diving Practices (2024)",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "US Navy Diving Manual Rev 7 (2023)",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "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.",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "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.",
      "fail_rate": 0.85,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "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.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "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.",
      "success_rate": 0.9,
      "how": "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.",
      "condition": "",
      "sources": []
    },
    {
      "action": "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.",
      "success_rate": 0.7,
      "how": "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.",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "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.",
    "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."
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.diversalertnetwork.org/health/decompression-sickness",
  "official_doc_section": null,
  "error_code": "DIVE-DECOMPRESSION-ERR",
  "verification_tier": "ai_generated",
  "confidence": 0.86,
  "fix_success_rate": 0.8,
  "resolvable": "partial",
  "first_seen": "2024-04-22",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}