What happens to buoyancy as you descend underwater?

As you descend underwater, buoyancy decreases due to the increasing pressure that affects the volume of air in your buoyancy control device (BCD) and the gases in your body. When you go deeper, the water pressure compresses the air in your BCD, causing a reduction in its volume and, consequently, a loss of buoyancy. This is why divers need to manage their buoyancy carefully, adding air to the BCD as they descend to maintain neutral buoyancy. Additionally, the compressibility of gases means that the air in your lungs also becomes denser, which further contributes to a decrease in buoyancy. Understanding this concept is essential for safe and effective diving practices, as it allows divers to adjust their buoyancy accordingly during descent.