Neutral Buoyancy: How to Hold Your Depth

Before You Dive

Neutral buoyancy starts before you descend. Correct weighting, a relaxed body position and patient use of your buoyancy control device (BCD) lay the groundwork for better control underwater.¹²

If you cannot hold a steady depth, start by considering your weights, body position and BCD adjustments. Each can cause an unwanted yo-yo effect in the water.¹²

Check Your Weight in Full Gear, Then Confirm It with Your Reserve Gas Intact ¹

For the initial check, float upright and still in water too deep to stand in. Wear all your equipment, empty your BCD and breathe normally. With the right weighting, you should float around eye level and begin to sink slowly as you exhale.¹

A diver with a scuba tank, regulator and BCD floats upright at the surface during a weight check for neutral buoyancy.

The source says the most accurate check uses an empty or nearly empty tank. If you check at the start of a dive with a full tank, account for it becoming lighter as you use the gas. Check again at the end of the dive with your reserve gas still available, rather than emptying the tank.¹

Too Much Weight: Sinking, Yo-Yoing and Constant BCD Adjustments ¹

Carrying extra weight does not make you safer. It can cause a rapid descent and leave you repeatedly adding and venting air to hold your depth.¹

A diver with a scuba tank, regulator and BCD hangs upright above a sandy seabed, kicking up a cloud of sand to illustrate excess weight and sinking.

The source lists common signs of excess weight: sinking like a stone, constantly moving up and down, repeatedly adjusting the BCD and sometimes holding your breath to stay off the bottom.¹

Too Little Weight: Struggling to Descend with an Empty BCD ¹

Difficulty descending does not always mean you need more weight. Rapid breathing, hand movements and unnecessary fin kicks can also keep you at the surface.¹

According to the source, if your BCD is empty and your breathing is calm but you still find yourself swimming head down and feet up to descend, you may be carrying too little weight.¹

A diver with a scuba tank, regulator and BCD swims head down and feet up, illustrating difficulty descending with too little weight.

Horizontal Trim Helps You Hold Depth with Efficient Fin Kicks ¹

A horizontal, streamlined position makes swimming more efficient, uses less energy and helps you maintain a steadier depth as you move.¹

When your feet point down, each fin kick can push you upward. The air in your BCD then expands, increasing your positive buoyancy.¹

Practice Even Basic Diving Skills in Neutral Buoyancy Whenever Possible ³

According to PADI Pros, skills should be taught in the buoyancy state appropriate to their use. Underwater, that usually means neutral buoyancy in a diving position, rather than kneeling by default.³

Two divers with scuba tanks and regulators practice a skill while neutrally buoyant above a training platform.

The source adds that even new students can begin working toward neutral buoyancy and a diving position, provided the instructor remains in control and adapts the practice to the environment and the divers’ abilities.³

Practical Steps

Check your weighting at the start of a dive trip, after changing equipment or tanks, or when switching between fresh and salt water. At the end of the dive, confirm that you can stay neutrally buoyant with a nearly empty tank and your gas reserve intact.¹

During the dive, make one small BCD adjustment and wait a few seconds to feel its effect. Adjust again only if needed.²

Maintain horizontal trim, use your fins to move forward rather than correct your depth, and let your breathing and small BCD adjustments work together instead of fighting the water.¹²