▁deep , ▁decom pression ▁and ▁mixed ▁gas ▁div ing . ▁By ▁mid ▁ 1 9 9 1 , ▁the ▁magazine ▁was ▁using ▁the ▁term ▁technical ▁div ing , ▁as ▁an ▁anal ogy ▁with ▁the ▁established ▁term ▁technical ▁( rock ) ▁clim bing . ▁In ▁the ▁US ▁the ▁Occ up ational ▁Saf ety ▁and ▁Health ▁Administration ▁categor ises ▁div ing ▁which ▁is ▁not ▁occup ational ▁as ▁recre ational ▁div ing ▁for ▁purposes ▁of ▁exem ption ▁from ▁reg ulation . ▁This ▁is ▁also ▁the ▁case ▁in ▁some ▁other ▁countries , ▁including ▁South ▁Africa . ▁ ▁Definition ▁▁ ▁There ▁is ▁some ▁professional ▁disag re ement ▁as ▁to ▁what ▁exactly ▁technical ▁div ing ▁en comp ass es . ▁N it ro x ▁div ing ▁and ▁re bre ather ▁div ing ▁were ▁originally ▁considered ▁technical , ▁but ▁this ▁is ▁no ▁longer ▁univers ally ▁the ▁case ▁as ▁several ▁cert ification ▁ag encies ▁now ▁offer ▁Rec re ational ▁N it ro x ▁and ▁recre ational ▁re bre ather ▁training ▁and ▁cert ification . ▁Some ▁training ▁ag encies ▁class ify ▁pen etr ation ▁div ing ▁in ▁w re cks ▁and ▁c aves ▁as ▁technical ▁div ing . ▁Even ▁those ▁who ▁agree ▁on ▁the ▁broad ▁definitions ▁of ▁technical ▁div ing ▁may ▁disag ree ▁on ▁the ▁precise ▁boundaries ▁between ▁technical ▁and ▁recre ational ▁div ing . ▁▁ ▁I ANT D ▁propose ▁a ▁description : ▁" Te chn ical ▁div ing ▁is ▁a ▁range ▁of ▁knowledge , ▁skills ▁and ▁suitable ▁equipment , ▁which ▁when ▁combined ▁correctly , ▁allow ▁recre ational ▁divers ▁to ▁increase ▁their