▁nearly ▁empty ▁cyl ind ers ▁is ▁an ▁example ▁of ▁a ▁bu oy ancy ▁problem ▁which ▁can ▁generally ▁not ▁be ▁corrected ▁by ▁the ▁diver . ▁If ▁an ▁empty ▁cyl inder ▁is ▁posit ively ▁bu oy ant , ▁the ▁diver ▁may ▁j ett ison ▁it ▁and ▁allow ▁it ▁to ▁float ▁away , ▁but ▁if ▁the ▁empty ▁cyl ind ers ▁are ▁neg atively ▁bu oy ant , ▁j ett ison ing ▁them ▁will ▁ex ac erb ate ▁the ▁problem , ▁making ▁the ▁diver ▁even ▁more ▁bu oy ant . ▁D ry ▁suit ▁and ▁bu oy ancy ▁compens ator ▁blow up ▁can ▁cause ▁run away ▁as cent , ▁which ▁can ▁usually ▁be ▁managed ▁if ▁corrected ▁immediately . ▁If ▁the ▁initial ▁problem ▁is ▁caused ▁by ▁loss ▁of ▁ball ast ▁weights ▁or ▁a ▁re el ▁jam ▁when ▁shooting ▁a ▁D S MB , ▁and ▁the ▁re el ▁is ▁cli pped ▁on , ▁the ▁diver ▁may ▁not ▁be ▁able ▁to ▁manage ▁several ▁simultaneously ▁acceler ating ▁bu oy ancy ▁mal functions . ▁Multiple ▁bl ad der ▁bu oy ancy ▁compens ators ▁can ▁contain ▁air ▁in ad vert ently ▁added ▁to ▁the ▁backup ▁bl ad der , ▁which ▁the ▁diver ▁does ▁not ▁release ▁as ▁it ▁is ▁not ▁supposed ▁to ▁be ▁there ▁in ▁the ▁first ▁place . ▁All ▁of ▁these ▁fail ures ▁can ▁be ▁either ▁avoided ▁altogether ▁or ▁the ▁risk ▁minim ised ▁by ▁configuration ▁choices , ▁proced ural ▁methods ▁and ▁correct ▁response ▁to ▁the ▁initial ▁problem . ▁ ▁Fail ure ▁to ▁control ▁depth ▁due ▁to ▁ins u fficient ▁bu oy ancy ▁can ▁also