▁that ▁technical ▁divers ▁who ▁surface ▁and ▁demonstrate ▁m ild ▁D CS ▁sympt oms ▁may ▁often ▁get ▁back ▁into ▁the ▁water ▁and ▁bre at he ▁pure ▁o xygen ▁at ▁a ▁depth ▁ ▁for ▁a ▁period ▁to ▁seek ▁to ▁alle vi ate ▁the ▁sympt oms . ▁This ▁tr end ▁is ▁noted ▁in ▁paragraph ▁ 3 . 6 . 5 ▁of ▁D AN ' s ▁ 2 0 0 8 ▁accident ▁report . ▁The ▁report ▁also ▁notes ▁that ▁whilst ▁the ▁reported ▁inc idents ▁showed ▁very ▁little ▁success , ▁"[ w ] e ▁must ▁recognize ▁that ▁these ▁calls ▁were ▁mostly ▁because ▁the ▁attempted ▁I WR ▁failed . ▁In ▁case ▁the ▁I WR ▁were ▁successful , ▁[ the ] ▁diver ▁would ▁not ▁have ▁called ▁to ▁report ▁the ▁event . ▁Thus ▁we ▁do ▁not ▁know ▁how ▁often ▁I WR ▁may ▁have ▁been ▁used ▁successfully ." ▁ ▁Histor ically , ▁in - water ▁recom pression ▁was ▁the ▁usual ▁method ▁of ▁tre ating ▁decom pression ▁sick ness ▁in ▁remote ▁areas . ▁Pro ced ures ▁were ▁often ▁inform al ▁and ▁based ▁on ▁operator ▁experience , ▁and ▁used ▁air ▁as ▁the ▁breath ing ▁gas ▁as ▁it ▁was ▁all ▁that ▁was ▁available . ▁The ▁divers ▁generally ▁used ▁standard ▁div ing ▁g ear , ▁which ▁was ▁relatively ▁safe ▁for ▁this ▁procedure , ▁as ▁the ▁diver ▁was ▁at ▁low ▁risk ▁of ▁d row ning ▁if ▁he ▁lost ▁conscious ness . ▁ ▁De com pression ▁equipment ▁▁ ▁There ▁are ▁several ▁types ▁of ▁equipment ▁used ▁to ▁help ▁divers ▁carry ▁out ▁decom pression . ▁Some ▁are ▁used ▁to ▁plan