▁ro pe ▁approximately ▁vertical . ▁The ▁shot ▁line ▁float ▁should ▁be ▁sufficiently ▁bu oy ant ▁to ▁support ▁the ▁weight ▁of ▁all ▁divers ▁that ▁are ▁likely ▁to ▁be ▁using ▁it ▁at ▁the ▁same ▁time . ▁Rec re ational ▁divers ▁are ▁free ▁to ▁choose ▁less er ▁bu oy ancy ▁at ▁their ▁own ▁risk . ▁The ▁shot ▁weight ▁should ▁be ▁sufficient ▁to ▁prevent ▁a ▁diver ▁from ▁lif ting ▁it ▁from ▁the ▁bottom ▁by ▁over - infl ation ▁of ▁the ▁bu oy ancy ▁compens ator ▁or ▁dry ▁suit , ▁but ▁not ▁sufficient ▁to ▁sink ▁the ▁float ▁if ▁the ▁s lack ▁on ▁the ▁line ▁is ▁all ▁taken ▁up . ▁Vari ous ▁configurations ▁of ▁shot ▁line ▁are ▁used ▁to ▁control ▁the ▁amount ▁of ▁s lack . ▁The ▁diver ▁asc ends ▁along ▁the ▁shot line , ▁and ▁may ▁use ▁it ▁purely ▁as ▁a ▁visual ▁reference , ▁or ▁can ▁hold ▁on ▁to ▁it ▁to ▁posit ively ▁control ▁depth , ▁or ▁can ▁clim b ▁up ▁it ▁hand ▁over ▁hand . ▁A ▁Jon line ▁may ▁be ▁used ▁to ▁fast en ▁a ▁diver ▁to ▁a ▁shot line ▁during ▁a ▁decom pression ▁stop . ▁ ▁A ▁decom pression ▁tra pe ze ▁or ▁decom pression ▁bar ▁is ▁a ▁device ▁used ▁in ▁recre ational ▁div ing ▁and ▁technical ▁div ing ▁to ▁make ▁decom pression ▁stops ▁more ▁comfortable ▁and ▁more ▁secure ▁and ▁provide ▁the ▁divers ' ▁surface ▁cover ▁with ▁a ▁visual ▁reference ▁for ▁the ▁divers ' ▁position . ▁It ▁consists ▁of ▁a ▁horizontal ▁bar ▁or ▁bars ▁susp ended ▁at ▁the ▁depth ▁of ▁intended ▁decom pression ▁stops ▁by ▁bu