“Deep air” is a concept among scuba divers indicating the type of diving: depths of more than 66 meters [1] , when diving into which air is used as a breathing mixture. During such descents, the diver is subject to nitrogen anesthesia and the swimmer is exposed to the toxic effect of oxygen .
The biggest problem with deep air is that divers try to make such dives often without proper education, training, equipment. Despite the regular reports of the death of swimmers, the number of people who want to dive deep in compressed air does not decrease. A decrease in the amount of oxygen in the breathing mixture reduces the likelihood of oxygen poisoning, and a decrease in the amount of nitrogen reduces the likelihood of nitrogen anesthesia .
Content
Learning Systems
PSA (Professional Scuba Association) provides training on the Narcosis Management course, the result of which is permission to dive in the air to a depth of 67 meters (Level VI) and 73 meters (Level VII) [2] . Until mid-2005, there was a Deep Air course, level VI of which gave permission for diving to a depth of 73 meters, and level VII - up to 91 meters (300 feet) [3] [4] .
Records
It should be remembered that all the latest records were set with the assistance of scuba support divers using gas mixtures containing helium.
- Fredrick Dumas - 93 meters.
- Bret Gilliam - 137 meters.
- Mark Andrews - 150 meters, July 27, 1999 [5] .
- Den Menon - 154 meters.
Links
- When calls "Wah-wah" (article from the American magazine "aquaCORPS")
Notes
- ↑ There are several options for determining the ultimate depths, after which the dive is "deep":
- 40 (42) m - this depth is the limit for which no decompression diving is possible.
- 45 m - at this depth, the partial pressure of nitrogen is 4.3 kgf / cm2, which allows us to talk about nitrogen anesthesia .
- 55 or 66 meters - the existing and outdated maximum depths of air dives in the TDI association's ER (Extended Range) mode.
- ↑ PSAI Extended Range Programs
- ↑ Sergey Cherkashin. Forty fathoms - this is not forty meters. OKTOPUS # 02 (14) 2001 (inaccessible link) (Russian)
- ↑ web.archive.org: PSA Deep Air
- ↑ 150 Meter Deep Air Record Set