When diving doubles you will need to use your wing/BCD to compensation. Typically you can't control your buoyancy only with a drysuit with steel doubles and stage bottles so you will need to use your wing to offset buoyancy.
The structure of the throat is designed to prevent food from entering the lungs. Photo Credit matthewennisphotography/iStock/Getty Images. When food enters the lungs instead of the esophagus, it affects breathing and can cause choking and other problems.
Food enters the lungs on rare occasions, and can be dangerous, or life-threatening. The throat (pharyx). There is a flap of tissue (cartilage) called the epiglottis, its nickname is the guardian of the airways, and it closes the windpipe (trachea) when you swallow. This makes sure no food goes into the lungs. Sometimes, if people eat too fast, talk, or laugh while they are eating, the flap may not close in time and food can go down the trachea, into a bronchus, and into a lung.