▁or ▁mines . ▁This ▁definition ▁does ▁not ▁make ▁a ▁strong ▁distinction ▁between ▁“ re cre ational ” ▁and ▁“ techn ical ” ▁as ▁both ▁styles ▁of ▁div ing ▁are ▁recre ational ▁and ▁require ▁similar ▁equipment . ▁ ▁The ▁government ▁of ▁Queensland , ▁Australia ▁defines ▁recre ational ▁technical ▁div ing ▁as ▁recre ational ▁div ing ▁using ▁nit ro x ▁or ▁other ▁mixed ▁gas , ▁or ▁any ▁div ing ▁requiring ▁decom pression . ▁ ▁B S AC ▁var ies ▁from ▁many ▁ag encies ▁in ▁allowing ▁some ▁st aged ▁decom pression ▁within ▁recre ational ▁div ing . ▁ ▁Its ▁definition ▁of ▁technical ▁div ing ▁is ▁div ing ▁which ▁involves ▁special ist ▁equipment ▁such ▁as ▁Cl osed ▁Circ uit ▁Reb re athers ▁( CC R ), ▁using ▁multiple ▁gas ▁mix es ▁on ▁open ▁circuit ▁or ▁that ▁uses ▁hel ium ▁based ▁gas ▁mi xt ures ▁term ed ▁M ixed ▁Gas . ▁ ▁The ▁European ▁div ing ▁ag encies ▁tend ▁to ▁draw ▁the ▁line ▁between ▁recre ational ▁and ▁technical ▁div ing ▁at ▁ ▁and ▁many , ▁as ▁noted ▁for ▁B S AC ▁above , ▁teach ▁st aged ▁decom pression ▁div ing ▁as ▁an ▁integral ▁part ▁of ▁recre ational ▁training , ▁rather ▁than ▁as ▁a ▁fundamental ▁change ▁of ▁scope . ▁The ▁Bü hl mann ▁tables ▁used ▁by ▁the ▁Sub - A qua ▁Association ▁and ▁other ▁European ▁ag encies ▁make ▁st aged ▁decom pression ▁div es ▁available , ▁and ▁the ▁S AA ▁teach es ▁mod est ▁st aged ▁decom pression ▁as ▁part ▁of ▁its ▁advanced ▁training ▁programme . ▁ ▁S cope