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For example I once came across a Rebreather diver who had bailed to OC. He was using a BOV. It didnt even register with me that there was exhaust bubbles coming out of his BOV. It took a few moments for him to get me to understand that he had bailed
I have a signal for said issue , Both Hands in fists thumb inserted in the top hand ( close your hand over thumb of the hand making the Go UP signal )
OFF Loop ( Hands apart showing thumb )
On LOOP ( hands together still )
signal can be used as a question by repeting or letting the buddy know by making exagerated fists out in front of you and pulled apart far.