iss ol ved , ▁and ▁performing ▁a ▁slow ▁decom pression ▁back ▁to ▁the ▁surface ▁pressure . ▁Later ▁air ▁tables ▁were ▁standard ised ▁to ▁specific ▁depth s , ▁followed ▁by ▁slow ▁decom pression . ▁This ▁procedure ▁has ▁been ▁su pers eded ▁almost ▁entirely ▁by ▁hyper bar ic ▁o xygen ▁treatment . ▁ ▁Hyper bar ic ▁o xygen ▁ther apy ▁▁ ▁Ev idence ▁of ▁the ▁effect iveness ▁of ▁recom pression ▁ther apy ▁util izing ▁o xygen ▁was ▁first ▁shown ▁by ▁Y ar br ough ▁and ▁Be hn ke ▁( 1 9 3 9 ), ▁and ▁has ▁since ▁become ▁the ▁standard ▁of ▁care ▁for ▁treatment ▁of ▁D CS . ▁ ▁A ▁typical ▁hyper bar ic ▁o xygen ▁treatment ▁schedule ▁is ▁the ▁US ▁Navy ▁Table ▁ 6 , ▁which ▁provides ▁for ▁a ▁standard ▁treatment ▁of ▁ 3 ▁to ▁ 5 ▁periods ▁of ▁ 2 0 ▁minutes ▁of ▁o xygen ▁breath ing ▁at ▁ 6 0   f sw ▁( 1 8 ms w ) ▁followed ▁by ▁ 2 ▁to ▁ 4 ▁periods ▁of ▁ 6 0 ▁minutes ▁at ▁ 3 0   f sw ▁( 9   ms w ) ▁before ▁sur f acing . ▁Air ▁breaks ▁are ▁taken ▁between ▁o xygen ▁breath ing ▁to ▁reduce ▁the ▁risk ▁of ▁o xygen ▁to x icity . ▁ ▁In ▁water ▁recom pression ▁▁ ▁If ▁a ▁chamber ▁is ▁not ▁available ▁for ▁recom pression ▁within ▁a ▁reasonable ▁period , ▁a ▁risk ier ▁alternative ▁is ▁in - water ▁recom pression ▁at ▁the ▁d ive ▁site . ▁In - water ▁recom pression ▁(