hours 44 minutes french navy recompression treatment table 3 (gers 1962) use: treatment of moderate to severe decompression sickness. oxygen is available maximum pressure 50 msw (164 fsw) run time 12 hours 44 minutes french navy recompression treatment table 4 (gers 1962) use: treatment of severe decompression sickness. oxygen is available maximum pressure 50 msw (164 fsw) run time 36 hours 14 minutes or 37 hours 44 minutes french navy recompression treatment table 4a (gers 1962) use: treatment of severe decompression sickness. oxygen is not available maximum pressure 50 msw (164 fsw) run time 38 hours 14 minutes or 39 hours 39 minutes french navy air recompression treatment table (gers 1964) use: treatment of decompression sickness. oxygen is not available or the patient cannot tolerate high partial pressures of oxygen maximum pressure 50 msw (164 fsw) run time 73 hours 10 minutes french navy air recompression treatment table (gers 1964) use: treatment of decompression sickness. oxygen is not available or the patient cannot tolerate high partial pressures of oxygen maximum pressure 50 msw (164 fsw) run time 76 hours 40 minutes french navy high-oxygen recompression treatment table (gers 1964) use: treatment of moderately severe decompression sickness. oxygen is available maximum pressure 30 msw (98 fsw) run time between 20 hours 33 minutes and 36 hours 3 minutes french navy recompression treatment table a (gers 1968) use: treatment of mild decompression sickness after dives to less than 40 m depth. oxygen is available maximum pressure 30 msw (98 fsw) run time 5 hours 33 minutes french navy recompression treatment table b (gers 1968) use: treatment of mild decompression sickness after dives to more than 40 m depth. oxygen is available maximum pressure 30 msw (98 fsw) run time 8 hours 3 minutes french navy recompression treatment table c (gers 1968) use: treatment of moderately severe decompression sickness after dives to more than 40m depth or severe decompression sickness after dives shallower than 40m. oxygen is available maximum pressure 30 msw (98 fsw) run time 14 hours 29 minutes to 36 hours 57 minutes french navy recompression treatment table d (gers 1968) use: treatment of moderately severe and severe decompression sickness. oxygen is not available or cannot be tolerated by the patient maximum pressure 50 msw (164 fsw) run time 69 hours 45 minutes or 77 hours 45 minutes french navy recompression treatment table 1a (gers 1968) use: treatment of mild decompression sickness after dives to less than 40 m. oxygen is not available or cannot be tolerated by the patient maximum pressure 30 msw (98 fsw) run time 7 hours 18 minutes french navy recompression treatment table 2a (gers 1968) use: treatment of mild decompression sickness after dives to more than 40 m. oxygen is not available or cannot be tolerated by the patient maximum pressure 50 msw (164 fsw) run time 12 hours 45 minutes french navy recompression treatment table 3a (gers 1968) use: treatment of moderate or severe decompression sickness. oxygen is not available or cannot be tolerated by the patient maximum pressure 50 msw (164 fsw) run time 20 hours 45 minutes comex therapeutic table cx 12 use: treatment of musculoskeletal decompression sickness following normal decompression if symptoms are relieved within 4 minutes or at less than 8 msw. oxygen is available maximum pressure 12 msw (40 fsw) run time 2 hours 10 minutes comex therapeutic table 18c use: treatment of musculoskeletal decompression sickness following normal or shortened decompression if symptoms are not relieved within 4 minutes at 8 msw, but are relieved within 15 minutes at or less than 18 msw. oxygen is available maximum pressure 18 msw (60 fsw) run time 2 hours 54 minutes comex therapeutic table 18l use: treatment of musculoskeletal decompression sickness following normal or shortened decompression if symptoms are not relieved within 15 minutes at 18 msw. oxygen is available maximum pressure 18 msw (60 fsw) run time 4 hours 59 minutes comex therapeutic table cx 30 use: treatment of vestibular and general neurological decompression sickness following normal or shortened decompression. oxygen and heliox 50 or nitrox 50 is available maximum pressure 30 msw (100 fsw) run time 7 hours 2 minutes comex therapeutic table cx 30a use: treatment of musculoskeletal decompression sickness when signs of oxygen toxicity are present. oxygen is available maximum pressure 30 msw run time 8 hours 44 minutes comex therapeutic table cx 30al use: treatment of vestibular and general neurological decompression sickness when signs of oxygen toxicity are present. oxygen is available maximum pressure 30 sw run time 11 hours 8 minutes russian therapeutic recompression regimen i use: treatment of light forms of decompression sickness when the symptoms are completely resolved when reaching a pressure of 29 msw (96 fsw). oxygen is not used maximum pressure 49 msw (160 fsw) run time 13 hours 9 minutes russian therapeutic recompression regimen ii use: treatment of light forms of decompression sickness when the symptoms are completely resolved when reaching a pressure of 49 msw (160 fsw), or if there is a relapse after use of regimen i. oxygen is not used maximum pressure 49 msw (160 fsw) run time 26 hours 11 minutes russian therapeutic recompression regimen iii use: treatment of moderately severe decompression sickness, or if there is a relapse after use of regimen ii. oxygen is not used maximum pressure 68 msw (224 fsw) run time 31 hours 26 minutes russian therapeutic recompression regimen iv use: treatment of severe decompression sickness, or if there is a relapse after use of regimen iii. oxygen is not used maximum pressure 97 msw (320 fsw) run time 39 hours 2 minutes russian therapeutic recompression regimen v use: treatment of very severe decompression sickness, or if there is a relapse after use of regimen iv. oxygen is not used. helium may optionally be used for compression below 224 fsw in addition to the air used for initial compression. maximum pressure 97 msw (320 fsw) run time 87 hours 7 minutes (3 days 15 hours 7 minutes) german short air recompression treatment table used during the rendsburg pedestrian tunnel project use: treatment of mild decompression sickness where relief occurs within 30 minutes at 30 msw (98 fsw) oxygen not used maximum pressure 30 msw (98 fsw) run time 2 hours 18 minutes german recompression treatment table used during the rendsburg pedestrian tunnel project use: treatment of mild decompression sickness where relief does not occur within 30 minutes at 30 msw (98 fsw) oxygen is used maximum pressure 30 msw (98 fsw) run time 5 hours 24 minutes german recompression treatment table used during the rendsburg pedestrian tunnel project use: treatment of severe decompression sickness where relief does not occur within 30 minutes at 30 msw (98 fsw) oxygen is used maximum pressure 30 msw (98 fsw) run time 36 hours 55 minutes or 38 hours 25 minutes oxygen tables designed for monoplace chambers (specifically for chambers without facility for air breaks) hart monoplace table 100% oxygen for 30 minutes at 3.0 ata followed by 60 minutes at 2.5 ata. kindwall's monoplace table indication: pain only or skin bends for symptoms that resolve within 10 minutes of reaching treatment depth: 30 minutes at 2.8 bar (60 fsw) continuous decompression to 1.9 bar over 15 minutes 60 minutes at 1.9 bar (30 fsw) continuous decompression to surface over 15 minutes neurological decompression sickness, arterial gas embolism or unresolved symptoms after 10 minutes at treatment pressure: 30 minutes at 2.8 bar (60 fsw) continuous decompression to 1.9 bar over 30 minutes 60 minutes at 1.9 bar (30 fsw) continuous decompression to surface over 30 minutes repeat after 30 minutes on air at surface pressure if symptoms have not resolved. in-water recompression schedules main article: in-water recompression in-water recompression (iwr) or underwater oxygen treatment is the emergency treatment of decompression sickness (dcs) by sending the diver back underwater to allow the gas bubbles in the tissues, which are causing the symptoms, to resolve. it is a risky procedure that should only ever be used when the time to travel to the nearest recompression chamber is too long to save the victim's life. carrying out in-water recompression when there is a nearby recompression chamber or without special equipment and training is never a favoured option. the risk of the procedure comes from the fact that a diver with dcs is seriously ill and may become paralysed, unconscious or stop breathing whilst under water. any one of these events is likely to result in the diver drowning or further injury to the diver during a subsequent rescue to the surface. six iwr treatment tables have been published in the scientific literature. each of these methods have several commonalities including the use of a full face mask, a tender to supervise the diver during treatment, a weighted recompression line and a means of communication. the history of the three older methods for providing oxygen at 9m (30 fsw) was described in great detail by drs. richard pyle and youngblood. the fourth method for providing oxygen at 7.5 m (25 fsw) was described by pyle at the 48th annual uhms workshop on in-water recompression in 1999. the clipperton method involves recompression to 9m (30 fsw) while the clipperton(a) rebreather method involves a recompression to 30m (98 fsw). recommended equipment common to these tables includes: a means of securely holding the casualty at a measured depth, such as a harness and 20 metre lazy shot line with a 20 kg lead weight at the bottom and a buoy at the top of at least 40 litres buoyancy a means of allowing the casualty to ascend slowly, such as loops in the line to which the harness could be clipped full face diving masks for the casualty and for an in-water attendant diver with two-way communication to the surface and an umbilical gas supply system surface supplied breathing gases including pure oxygen and air delivered to the casualty by umbilical australian in-water recompression table the australian iwr tables were developed by the royal australian navy in the 1960s in response to their need for treatment in remote locations far away from recompression chambers. it was the shallow portion of the table developed for recompression chamber use. oxygen is breathed the entire portion of the treatment without any air breaks and is followed by alternating periods (12 hours) of oxygen and air breathing on the surface. clipperton in-water recompression tables the clipperton and clipperton(a) methods were developed for use on a scientific mission to the atoll of clipperton, 1,300 km from the mexican coast. the two versions are based on the equipment available for treatment with the clipperton(a) table being designed for use with rebreathers. both methods begin with 10 minutes of surface oxygen. for the clipperton iwr table, oxygen is then breathed the entire portion of the treatment without any air breaks. for the clipperton(a) iwr table, descent is made to the initial treatment depth maintaining a partial pressure of 1.4 ata. oxygen breathing on the surface for 6 hours post treatment and intravenous fluids are also administered following both treatment tables. hawaiian in-water recompression table hawaiian in-water recompression table the hawaiian iwr table was first described by farm et al. while studying the diving habits of hawaii's diving fishermen. the initial portion of the treatment involves descent on air to the depth of relief plus 30 fsw or a maximum of 165 fsw for ten minutes. ascent from initial treatment depth to 30 fsw occurs over 10 minutes. the diver then completes the treatment breathing oxygen and is followed by oxygen breathing on the surface for 30 minutes post treatment. the hawaiian iwr table with pyle modifications can be found in the proceedings of the dan 2008 technical diving conference (in press) or through download from dan here. pyle in-water recompression table the pyle iwr table was developed by dr. richard pyle as a method for treating dcs in the field following scientific dives. this method begins with a 10-minute surface oxygen evaluation period. compression to 25 fsw on oxygen for another 10-minute evaluation period. the table is best described by the treatment algorithm (pyle iwr algorithm). this table does include alternating air breathing periods or "air breaks". us navy in-water recompression tables the us navy developed two iwr treatment tables. the table used depends on the symptoms diagnosed