▁avoid ance ▁of ▁excess ive ▁b ubble ▁formation . ▁St aged ▁decom pression ▁may ▁include ▁deep ▁stops ▁depending ▁on ▁the ▁theoretical ▁model ▁used ▁for ▁calculating ▁the ▁as cent ▁schedule . ▁O mission ▁of ▁decom pression ▁theoret ically ▁required ▁for ▁a ▁d ive ▁profile ▁ex poses ▁the ▁diver ▁to ▁significantly ▁higher ▁risk ▁of ▁sympt om atic ▁decom pression ▁sick ness , ▁and ▁in ▁severe ▁cases , ▁serious ▁injury ▁or ▁death . ▁The ▁risk ▁is ▁related ▁to ▁the ▁sever ity ▁of ▁expos ure ▁and ▁the ▁level ▁of ▁su pers atur ation ▁of ▁t issues ▁in ▁the ▁diver . ▁Pro ced ures ▁for ▁emer gency ▁management ▁of ▁omitted ▁decom pression ▁and ▁sympt om atic ▁decom pression ▁sick ness ▁have ▁been ▁published . ▁These ▁procedures ▁are ▁generally ▁effective , ▁but ▁vary ▁in ▁effect iveness ▁from ▁case ▁to ▁case . ▁ ▁The ▁procedures ▁used ▁for ▁decom pression ▁depend ▁on ▁the ▁mode ▁of ▁div ing , ▁the ▁available ▁equipment , ▁the ▁site ▁and ▁environment , ▁and ▁the ▁actual ▁d ive ▁profile . ▁Standard ized ▁procedures ▁have ▁been ▁developed ▁which ▁provide ▁an ▁acceptable ▁level ▁of ▁risk ▁in ▁the ▁circumstances ▁for ▁which ▁they ▁are ▁appropriate . ▁D ifferent ▁sets ▁of ▁procedures ▁are ▁used ▁by ▁commercial , ▁military , ▁scientific ▁and ▁recre ational ▁divers , ▁though ▁there ▁is ▁considerable ▁overlap ▁where ▁similar ▁equipment ▁is ▁used , ▁and ▁some ▁concepts ▁are ▁common ▁to ▁all ▁decom pression ▁procedures . ▁ ▁De com pression ▁ ▁De com pression ▁in ▁the ▁context ▁of ▁div ing ▁der ives ▁from ▁the ▁reduction ▁in ▁ambient ▁pressure ▁experienced ▁by ▁the