Altitude diving
Diving at altitude requires specific adjustments to your decompression profile. Understanding the physiological effects is critical.
Decompression changes at altitude
Never attempt altitude diving without specific training. Standard dive tables do not apply; use altitude-specific tables or a computer set for altitude.
Why altitude matters
Lower atmospheric pressure at altitude means that nitrogen absorption and elimination occur differently compared to sea-level diving.
Standard decompression models assume sea-level pressure. You must account for the change to avoid decompression illness.
Equipment and computer settings
Many modern dive computers can be set to altitude mode. Ensure your computer is correctly configured for the specific altitude of your dive site before entering the water.
If using tables, ensure they are specifically designed for altitude diving and follow them precisely.
Ascent and post-dive
Ascending from altitude can increase the risk of decompression illness. Be aware of the altitude of your exit point and any travel planned immediately after.
Consult with your training organization to understand all safety protocols related to altitude diving.
Dive-day checklist
Altitude planning
- Get specific altitude training
- Verify altitude settings on your computer
- Use altitude-corrected tables if applicable
- Plan for the altitude of your travel
- Consult experts on site-specific risks
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.