I don't know how you could hold your breath with double the volume in lungs. That at only one atmosphere. Not to mention your ears. Part of releasing air as y

I don't know how you could hold your breath with double the volume in lungs. That at only one atmosphere. Not to mention your ears. Part of releasing air as you ascend is to help your ears adjust. Its only natural. Same with descending. I have seen alot of minor injury as a summer dive boat mate. Mostly blood vessels burst in the eyes from people holding their breath ascending.. I saw a guy pop out of the water like a cork because the ran out of air. Of course he said he was Navy UDT. Didn't need a buddy. Steel doubles and a speargun. Thankfully nobody got hurt. NAUI Diver with over 45 dives in Hatteras.