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* excerpted from “The UHMS Flying After Diving Workshop”
** excerpted from “DAN’s Current Position on Recreational Flying After Diving”.
In 1990 the Undersea and Hyperbaric Medical Society (UHMS) published a set of guidelines aimed at minimiz-
ing the possibility of decompression sickness due to flying too soon after diving. The UHMS suggests*
divers using standard air cylinders and exhibiting no symptoms of decompression sickness wait 24 hours after
their last dive to fly in aircraft with cabin pressures up to 8,000 feet. (2,440 meters).
The two exceptions to this recommendation are:
• If a diver had less than 2 hours total accumulated dive time in the last 48 hours, then a 12 hour surface
interval before flying is recommended.
• Following any dive that required a decompression stop, flying should be delayed for at least 24 hours, and
if possible, for 48 hours.
Since the 1990 UHMS guidelines were introduced, data from the Diver’s Alert Network (DAN) was introduced
that resulted in DAN’s 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 ex-
tended 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 guaranteed to pre-
vent 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 always be an occasional diver
whose physiological makeup or special diving circumstances will result in the bends”.
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