▁infl ated ▁by ▁the ▁diver ▁under ▁water ▁and ▁released ▁to ▁float ▁to ▁the ▁surface , ▁deploy ing ▁the ▁line ▁as ▁it ▁asc ends . ▁This ▁provides ▁information ▁to ▁the ▁surface ▁that ▁the ▁diver ▁is ▁about ▁to ▁asc end , ▁and ▁where ▁he ▁is . ▁This ▁equipment ▁is ▁commonly ▁used ▁by ▁recre ational ▁and ▁technical ▁divers , ▁and ▁requires ▁a ▁certain ▁level ▁of ▁skill ▁to ▁operate ▁safely . ▁They ▁are ▁mostly ▁used ▁to ▁signal ▁the ▁boat ▁that ▁the ▁diver ▁has ▁started ▁as cent ▁or ▁to ▁indicate ▁a ▁problem ▁in ▁technical ▁div ing . ▁ ▁A ▁div ing ▁stage , ▁sometimes ▁known ▁as ▁the ▁basket , ▁or ▁diver ▁launch ▁and ▁recovery ▁system ▁( L AR S ), ▁is ▁a ▁platform ▁on ▁which ▁one ▁or ▁two ▁divers ▁stand ▁which ▁is ▁ho isted ▁into ▁the ▁water , ▁lower ed ▁to ▁the ▁work place ▁or ▁the ▁bottom , ▁and ▁then ▁ho isted ▁up ▁again ▁to ▁return ▁the ▁diver ▁to ▁the ▁surface ▁and ▁lift ▁him ▁out ▁of ▁the ▁water . ▁This ▁equipment ▁is ▁almost ▁exclus ively ▁used ▁by ▁surface ▁supplied ▁professional ▁divers , ▁as ▁it ▁requires ▁fairly ▁complex ▁lif ting ▁equipment . ▁A ▁div ing ▁stage ▁allows ▁the ▁surface ▁team ▁to ▁convenient ly ▁manage ▁a ▁diver ' s ▁decom pression ▁as ▁it ▁can ▁be ▁ho isted ▁at ▁a ▁controlled ▁rate ▁and ▁stopped ▁at ▁the ▁correct ▁depth ▁for ▁decom pression ▁stops , ▁and ▁allows ▁the ▁divers ▁to ▁rest ▁during ▁the ▁as cent . ▁It ▁also ▁allows ▁the ▁divers ▁to ▁be ▁relatively ▁safely ▁and ▁convenient ly ▁lifted ▁out ▁of ▁the ▁water