The new procedures were based on the diver’s repetitive group upon surfacing from a dive and on the expected post-dive altitude. The results of the study were used by the US Navy in 1999 to revise its rules for ascent to altitude following air diving. For repetitive, no-stop dives, DCS occurred for surface intervals of less than 17 hours. For single no-stop dives to 60 fsw (feet of sea water 18 msw, or meters of sea water) or deeper, there was no DCS for surface intervals of 11 hours or longer.
In 802 trials, there were 40 DCS incidents during or after flight. The dives were followed by four-hour simulated flights at 8,000 feet (2,438 meters). Dry, resting volunteers tested nine single and repetitive dive profiles that were near the recreational diving no-decompression limits. There were objections to this on the grounds that the decompression sickness (DCS) risks of flying after diving (FAD) were too low to warrant such a long delay and would result in lost business for island diving resorts.īecause little human experimental data could be found that was relevant to flying after recreational diving, DAN funded a series of trials at the Duke University Center for Hyperbaric Medicine and Environmental Physiology that were conducted from 1992-1999. Subsequently, DAN proposed a simpler 24-hour wait after any and all recreational diving.
Previous consensus advised to wait 12 hours after a single no-stop dive, 24 hours after multi-day repetitive dive, and 48 hours after dives that required decompression stops. The workshop had two purposes: (a) to review the guidelines and experimental data developed since the first flying after diving workshop in 1989 and (b) to debate a consensus for new flying after recreational diving guidelines. This workshop on flying after recreational diving was organized by Divers Alert Network (DAN) to bring together representatives from the recreational diving industry with experts from other diving communities.
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