When should divers start using a buoyancy control device (BCD) while ascending?

Using a buoyancy control device (BCD) during the last few meters of ascent is important for maintaining safe and controlled buoyancy as divers approach the surface. During ascent, it’s crucial to manage buoyancy to prevent rapid ascents, which can lead to serious conditions such as decompression sickness or lung overexpansion injuries.

Employing the BCD in the final stages of ascent allows divers to make necessary adjustments to their buoyancy, which is particularly important because they may become increasingly buoyant as they near the surface due to expanding air in the lungs. This control helps to stabilize their ascent rate, ensuring that it is slow and within safe limits – typically no faster than 18 meters (60 feet) per minute as recommended by diving guidelines.

Beginning to use the BCD from the last few meters of the ascent also allows a diver to maintain a controlled position and readiness to stop if necessary. Divers are trained to be aware of their buoyancy throughout the dive, but actively using the BCD for adjustments during these critical moments enhances safety and helps prevent uncontrolled ascents.