⚠️🚫example of a freediving no-no🚫⚠️ • Please don’t ever breathe air underwater mid-freedive as it risks lung overexpansion (pulmonary overinflation). 𝙒𝙝𝙮? Boyles Law states that at constant temperature, volume of a gas is inversely related to pressure. So as the pressure decreases upon ascent, the volume INCREASES. 𝙃𝙤𝙬? When additional air is consumed at depth and a diver surfaces without exhaling, over tension or shear forces from the expansion of gas will cause damages (notably pneumomediastinum - rupture of alveoli, aka air sacs, & surrounding blood vessels). 𝙎𝙮𝙢𝙥𝙩𝙤𝙢𝙨 Chest discomfort and/or pain, coughing, shortness of breath, difficulty swallowing, change in voice, or a crunching sound listening to the heartbeat (Hamman’s sign). Here are 3 other things the diver did wrong: 1. 𝐈𝐧𝐡𝐚𝐥𝐢𝐧𝐠 𝐚𝐢𝐫 𝐟𝐫𝐨𝐦 𝐚 𝐩𝐨𝐜𝐤𝐞𝐭 𝐨𝐟 𝐚𝐧 𝐮𝐧𝐝𝐞𝐫𝐰𝐚𝐭𝐞𝐫 𝐜𝐚𝐯𝐞. You do not know the air quality: it may be stale, contaminated with gases, or have low oxygen levels. 2. 𝐃𝐢𝐯𝐢𝐧𝐠 𝐰𝐢𝐭𝐡𝐨𝐮𝐭 𝐚 𝐛𝐮𝐝𝐝𝐲. It is critical to always have someone watching you to ensure you can get help if there is an accident, ranging from a shallow water blackout, bumping your head on the cave, or getting stuck! 3. 𝐃𝐢𝐯𝐢𝐧𝐠 𝐰𝐢𝐭𝐡 𝐭𝐡𝐞 𝐬𝐧𝐨𝐫𝐤𝐞𝐥 𝐢𝐧 𝐭𝐡𝐞 𝐦𝐨𝐮𝐭𝐡. The first thing you do when you surface should be breathing in air (recovery breaths), NOT spitting out a snorkel. Removing a snorkel upon surfacing puts you more at risk for blackout. Also, if you blackout underwater, your mouth will not be locked shut, allowing water to enter down your throat and into your lungs. • It is our responsibility as divers to call out these bad practices & educate! Always do so with kindness & please dive safe 🙏❤️ #freedivingsafety #safety #underwatersafety #informative #educational #aida #padi #tip - @natalieunderwater