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Decompression Sickness Risk


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Prior to using this free decompression software, it is a good idea to read the Instruction Guide and Manual.

This page is very important to read.

Divers are taught that there is always a risk of decompression sickness after any dive and that no dive table, computer, or software program can guarantee that decompression sickness will not occur.  This needs to be taken very seriously.  In addition to reading and understanding the articles on this web site including decompression strategies and ascending from a dive, a diver needs to plan their dives conservatively.

Many dives that are acceptable according to tables have resulted in decompression sickness.  The following are some examples from some controlled studies.  Therefore, plan your dive very conservatively especially since decompression divers are choosing to enter into mandatory decompression obligation.

Recreational Dives

Recreational Dive Tests on air (descent and ascent rate was 30 feet (9 m.) per minute):
     100 feet (30 meters) for 20 minutes: 2.7% decompression sickness resulted.
     40 feet (12 meters) for 60 minutes followed by a 60 minute surface interval and then another dive to 40 feet (12 meters) for 60 minutes resulted in a 2.5% decompression sickness incidence.  This is after a surface interval between the dives where the diver is off-gassing even though most tables and software would allow this dive to 40 feet/12 meters for 120 minutes straight without the surface interval which would result in a higher decompression incidence.

Decompression Dives

Decompression Dive Tests (on air) by the U.S. Navy Experimental Diving Unit:
    170 feet (52 meters) for 30 minutes followed by 174 minutes of decompression with a very acceptable profile resulted in a 1.5% decompression sickness incidence.  This is generally considered an acceptable limit with testing unless you are the diver that got decompression sickness without being next to a recompression chamber.  For comparison purposes, the DCIEM tables only require 77 minutes of decompression, IANTD's tables only require 67 minutes of decompression, Buhlmann only requires 66 minutes of decompression (30 minutes at 51 meters/167 feet), and original RGBM tables only required 22 minutes of decompression (for 170'/25 minutes - a 30 minute profile was not published) - all of which would increase the decompression sickness incidence dramatically.  While Departure's software in a nominal opened up mode would require 104 minutes of decompression and in a slightly mild setting would require 165 minutes of decompression (with more adjustment possible based on the settings chosen), this still shows that some incidence of decompression sickness would occur in some divers.

There are many more examples, so again, dive smart and be conservative.


 
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