▁and ▁tend ▁to ▁use ▁algorithms ▁developed ▁for ▁other ▁types ▁of ▁div ing , ▁often ▁ext rap ol ated ▁to ▁depth s ▁for ▁which ▁no ▁formal ▁testing ▁has ▁been ▁done . ▁O ften ▁modifications ▁are ▁made ▁to ▁produce ▁shorter ▁or ▁sa fer ▁decom pression ▁sched ules , ▁but ▁the ▁evidence ▁relevant ▁to ▁these ▁modifications ▁is ▁often ▁difficult ▁to ▁locate ▁when ▁it ▁exists . ▁The ▁w ides p read ▁belief ▁that ▁b ubble ▁algorithms ▁and ▁other ▁modifications ▁which ▁produce ▁deeper ▁stops ▁are ▁more ▁efficient ▁than ▁the ▁dissol ved ▁phase ▁models ▁is ▁not ▁bor ne ▁out ▁by ▁formal ▁experimental ▁data , ▁which ▁suggest ▁that ▁the ▁inc idence ▁of ▁decom pression ▁sympt oms ▁may ▁be ▁higher ▁for ▁same ▁duration ▁sched ules ▁using ▁deeper ▁stops , ▁due ▁to ▁greater ▁s atur ation ▁of ▁slower ▁t issues ▁over ▁the ▁deeper ▁profile . ▁ ▁Special ised ▁decom pression ▁procedures ▁ ▁Gas ▁switching ▁It ▁appears ▁that ▁gas ▁switching ▁from ▁mi xt ures ▁based ▁on ▁hel ium ▁to ▁nit ro x ▁during ▁as cent ▁does ▁not ▁acceler ate ▁decom pression ▁in ▁comparison ▁with ▁ ▁div es ▁using ▁only ▁hel ium ▁dil uent , ▁but ▁there ▁is ▁some ▁evidence ▁that ▁the ▁type ▁of ▁sympt oms ▁displayed ▁is ▁ske wed ▁towards ▁ne uro log ical ▁in ▁hel io x ▁only ▁div es . ▁There ▁is ▁also ▁some ▁evidence ▁that ▁hel io x ▁to ▁nit ro x ▁switch es ▁are ▁imp licated ▁in ▁inner ▁ear ▁decom pression ▁sick ness ▁sympt oms ▁which ▁occur ▁during ▁decom pression . ▁S ugg ested ▁strateg ies ▁to ▁minim ise