: ▁Prov iding ▁that ▁the ▁depth ▁is ▁shall ow ▁enough ▁that ▁effectively ▁no ▁further ▁in ert ▁gas ▁t issue ▁loading ▁will ▁occur , ▁more ▁decom pression ▁time ▁will ▁reduce ▁the ▁risk ▁of ▁decom pression ▁sick ness , ▁but ▁with ▁dimin ishing ▁returns . ▁In ▁practice ▁this ▁can ▁be ▁facil itated ▁by ▁using ▁two ▁decom pression ▁computers . ▁One ▁is ▁set ▁at ▁the ▁least ▁conserv ative ▁setting ▁acceptable ▁to ▁the ▁diver , ▁and ▁is ▁used ▁to ▁indicate ▁minimum ▁acceptable ▁decom pression ▁and ▁time ▁to ▁surface . ▁The ▁other ▁is ▁set ▁at ▁a ▁conserv at ism ▁which ▁the ▁diver ▁cons iders ▁ade qu ate ▁and ▁low ▁risk . ▁De com pression ▁will ▁normally ▁be ▁done ▁following ▁the ▁conserv ative ▁setting , ▁but ▁if ▁circumstances ▁suggest ▁getting ▁out ▁of ▁the ▁water ▁sooner , ▁the ▁less ▁conserv ative ▁computer ▁will ▁show ▁when ▁the ▁risk ▁is ▁at ▁least ▁accept ably ▁low . ▁Re h yd r ation : ▁ ▁Rest : ▁M ild ▁exercise ▁during ▁decom pression : ▁Su fficient ▁exercise ▁to ▁stim ulate ▁the ▁circul ation ▁and ▁maintain ▁body ▁temperature ▁is ▁thought ▁to ▁acceler ate ▁in ert ▁gas ▁was h out , ▁therefore ▁reducing ▁the ▁risk ▁of ▁decom pression ▁sick ness ▁for ▁a ▁given ▁decom pression ▁schedule . ▁Core ▁temperature ▁recovery ▁Sur face ▁o xygen ▁breath ing : ▁The ▁use ▁of ▁o xygen ▁or ▁nit ro x ▁as ▁a ▁post ▁d ive ▁breath ing ▁mixture ▁is ▁recommended ▁in ▁cases ▁where ▁incomplete ▁decom pression ▁or ▁short ▁periods ▁of ▁omitted ▁decom pression ▁have ▁occurred , ▁or ▁at ▁any ▁time