▁by ▁the ▁b ub bles ▁can ▁cause ▁damage ▁to ▁t issues ▁known ▁as ▁decom pression ▁sick ness , ▁or ▁" the ▁b ends ". ▁The ▁immediate ▁goal ▁of ▁controlled ▁decom pression ▁is ▁to ▁avoid ▁development ▁of ▁sympt oms ▁of ▁b ubble ▁formation ▁in ▁the ▁t issues ▁of ▁the ▁diver , ▁and ▁the ▁long - term ▁goal ▁is ▁to ▁also ▁avoid ▁comp lications ▁due ▁to ▁sub - cl in ical ▁decom pression ▁injury . ▁ ▁A ▁diver ▁who ▁exceed s ▁the ▁no - de com pression ▁limit ▁for ▁a ▁decom pression ▁algorithm ▁or ▁table ▁has ▁a ▁theoretical ▁t issue ▁gas ▁loading ▁which ▁is ▁considered ▁likely ▁to ▁cause ▁sympt om atic ▁b ubble ▁formation ▁unless ▁the ▁as cent ▁follows ▁a ▁decom pression ▁schedule , ▁is ▁said ▁to ▁have ▁a ▁decom pression ▁oblig ation . ▁ ▁Common ▁procedures ▁ ▁The ▁descent , ▁bottom ▁time ▁and ▁as cent ▁are ▁se ctors ▁common ▁to ▁all ▁div es ▁and ▁hyper bar ic ▁expos ures . ▁ ▁Des cent ▁rate ▁ ▁Des cent ▁rate ▁is ▁generally ▁allowed ▁for ▁in ▁decom pression ▁planning ▁by ▁assuming ▁a ▁maximum ▁descent ▁rate ▁specified ▁in ▁the ▁instructions ▁for ▁the ▁use ▁of ▁the ▁tables , ▁but ▁it ▁is ▁not ▁critical . ▁Des cent ▁slower ▁than ▁the ▁nom inal ▁rate ▁reduces ▁useful ▁bottom ▁time , ▁but ▁has ▁no ▁other ▁ad verse ▁effect . ▁Des cent ▁faster ▁than ▁the ▁specified ▁maximum ▁will ▁expose ▁the ▁diver ▁to ▁greater ▁ing ass ing ▁rate ▁earlier ▁in ▁the ▁d ive , ▁and ▁the ▁bottom ▁time ▁must ▁be ▁reduced ▁accordingly . ▁In ▁the