■Buoyancy changes due to pressure

As you descend, increasing water pressure compresses the wetsuit. As the suit compresses, it provides less buoyancy, so you may become more negatively buoyant.

Wetsuits become thinner as pressure increases.

■Buoyancy changes as cylinder pressure decreases

Air has weight. As you breathe down your cylinder, the cylinder becomes lighter. This means you become more buoyant toward the end of the dive.

Air has weight.