101
Since the 1990 UHMS guidelines were introduced, data from the Divers Alert Network (DAN) was
introduced that resulted in DANs position** that A minimum surface interval of only 12 hours
would be required in order to be reasonably assured a diver will remain symptom free upon ascent to
altitude in a commercial jet airliner (altitude up to 8,000 feet/2,440 meters). Divers who plan to
make daily, multiple dives for several days, or make dives that require decompression stops, should
take special precautions and wait for an extended surface interval beyond 12 hours before flight.
Both the UHMS and DAN agree that There can never be a flying after diving rule that is guaran-
teed to prevent decompression sickness completely. Rather, there can be a guideline that represents
the best estimate for a conservative . . . surface interval for the vast majority of divers. There will al-
ways be an occasional diver whose physiological makeup or special diving circumstances will result
in the bends.
To reduce the risk of developing decompression sickness after a single no decompression dive, cur-
rent guidelines suggest waiting 12 hours prior to exposure to atmospheric pressures equivalent to
1,000 feet (330 meters) above sea level, or greater. When repetitive dives are conducted during the
same day, or period of days, it is suggested that the interval be increased to a minimum of 24 hours.
Note that land travel to higher elevations after diving must also be considered as an exposure to alti-
tude.
CONCLUSION
The ATMOS
ai
is an informational tool whose entire worth depends on understanding all of its fea-
tures and functions, and using it correctly.
Learn how to use it and use it wisely. Be a Responsible Diver!
** excerpted from DANs Position on Recreational Flying After
Diving
