▁to ▁the ▁oblig atory ▁decom pression ▁on ▁st aged ▁div es . ▁Many ▁d ive ▁computers ▁indicate ▁a ▁recommended ▁safety ▁stop ▁as ▁standard ▁procedure ▁for ▁div es ▁beyond ▁specific ▁limits ▁of ▁depth ▁and ▁time . ▁The ▁Gold man ▁decom pression ▁model ▁predict s ▁a ▁significant ▁risk ▁reduction ▁following ▁a ▁safety ▁stop ▁on ▁a ▁low - ris k ▁d ive ▁ ▁No ▁decom pression ▁limit ▁ ▁The ▁no ▁decom pression ▁limit ▁( ND L ) ▁or ▁no ▁stop ▁time , ▁is ▁the ▁time ▁interval ▁that ▁a ▁diver ▁may ▁theoret ically ▁spend ▁at ▁a ▁given ▁depth ▁without ▁having ▁to ▁perform ▁any ▁decom pression ▁stops . ▁The ▁N DL ▁helps ▁divers ▁plan ▁div es ▁so ▁that ▁they ▁can ▁stay ▁at ▁a ▁given ▁depth ▁for ▁the ▁given ▁time ▁and ▁then ▁asc end ▁without ▁stopping ▁while ▁still ▁avoid ing ▁an ▁un accept able ▁risk ▁of ▁decom pression ▁sick ness . ▁ ▁The ▁N DL ▁is ▁a ▁theoretical ▁time ▁obtained ▁by ▁calculating ▁in ert ▁gas ▁u pt ake ▁and ▁release ▁in ▁the ▁body , ▁using ▁a ▁model ▁such ▁as ▁the ▁Bü hl mann ▁decom pression ▁algorithm . ▁Although ▁the ▁science ▁of ▁calculating ▁these ▁limits ▁has ▁been ▁ref ined ▁over ▁the ▁last ▁century , ▁there ▁is ▁still ▁much ▁that ▁is ▁unknown ▁about ▁how ▁in ert ▁g ases ▁enter ▁and ▁leave ▁the ▁human ▁body . ▁In ▁addition , ▁every ▁individual ' s ▁body ▁is ▁unique ▁and ▁may ▁abs orb ▁and ▁release ▁in ert ▁g ases ▁at ▁different ▁rates . ▁For ▁this ▁reason , ▁d ive ▁tables ▁typically ▁have ▁a ▁degree ▁of