What is neutral buoyancy? SCUBA divers like to be neutrally buoyant so they neither sink nor float. It can be a tricky thing. Divers who’ve mastered the highest performance levels in buoyancy stand apart. You’ve seen them underwater. They glide effortlessly, use less air and ascend, descend or hover, almost as if by thought. They interact gently with aquatic life and affect their surroundings minimally.