Hands-Free Equalisation (BTV): Can You Learn It?

Hands-free equalisation, usually called BTV after the French béance tubaire volontaire (voluntary tubal opening), means opening your Eustachian tubes with throat and palate muscles alone, without pinching your nose or pushing any air. A few people can do it naturally, more can learn it with patient practice, and some never manage it however hard they try. It is a nice skill to have, not a requirement: plenty of very deep freedivers have used Frenzel and mouthfill their whole careers.

If you have ever noticed your ears click when you yawn, you have already felt the movement this technique is built on. In search terms, hands-free equalization is really just learning to do that click on purpose.

How hands-free equalisation works

Your Eustachian tubes are closed at rest. They open briefly whenever you swallow or yawn, pulled open by small muscles around the soft palate. The main one is the tensor veli palatini, helped by the levator veli palatini. BTV means learning to fire those muscles on purpose, without the rest of the swallow or yawn.

Opening the tubes is enough on its own, for a simple reason. As you descend, your lungs compress, so the air in your airway, including the back of your nose, sits at roughly the same pressure as the water around you. The air in your middle ear lags behind. Open the tube and the higher-pressure air from your throat flows in by itself. No push required.

That is also the catch. It only works if you open the tubes often enough that the difference never gets big. Leave it too long and the tube openings get squashed shut, as they do with any technique. Divers who use BTV well tend to open their tubes every few kicks near the surface, almost like a background habit, rather than waiting for a cue from their ears.

Who can learn it?

Honestly, nobody can tell in advance. Some people discover they have been doing it on flights for years. Others get a partial version, where the tubes open with a little help from a light Frenzel. Some practise for months and get nothing, which says nothing about how good a freediver they are.

A simple test: sit somewhere quiet, close your mouth and start a yawn without finishing it. If you hear a click, or your hearing briefly sounds more open, your tubes just opened. Now try to repeat that without the yawn. If you can do it at will, you have found BTV.

Ear rumbling isn’t BTV

Many people can make a low rumbling or roaring sound in their ears by tensing something in their head. That is usually the tensor tympani, a tiny muscle inside the middle ear that tightens the eardrum. It is a different muscle in a different place, and it doesn’t open the tube.

The difference matters because people can spend weeks practising what they think is BTV when it is really the rumble. A real tube opening tends to feel like a click, a crackle or a subtle change in pressure, not a sustained rumble.

Drills for voluntary tubal opening

Do these sitting upright, in short sessions, a few times a day.

Attentive swallowing. Swallow slowly and notice the click in each ear. Then try a half swallow, stopping as soon as you feel the click, before your tongue finishes the movement.
The closed-mouth yawn. Start a yawn with your lips closed and stop just before it takes over. Notice what the back of your throat does.
Watch your soft palate. Open your mouth in front of a mirror and start a yawn. You will see the soft palate and uvula lift. Try to lift them without the yawn.
Jaw forward. Push your lower jaw forward and slightly down, then add the soft palate lift. Some people find this combination opens the tubes.
Pinch and swallow. Pinch your nose and swallow, known as the Toynbee manoeuvre. It gives you a stronger sensation of the tubes moving.
Light Frenzel plus lift. Pinch your nose and build a tiny bit of pressure with your tongue, too little to clear your ears by itself. Then lift the soft palate as if starting a yawn. If your ears click, the palate muscles did the work. Over the following sessions, reduce the tongue pressure towards zero.

Our post on equalisation exercises you can practise at your desk has the glottis and soft palate drills that support these.

Using hands-free equalisation in the water

If you can do it reliably on land, start in shallow water, feet-first along a line or the pool wall, with a buddy watching.

Open little and often. Every half metre near the surface, before you feel any pressure.
Still equalise your mask. Your mask doesn’t care what your ears are doing. You still need to breathe a small puff of air out through your nose into it, or you will end up with mask squeeze.
Keep Frenzel ready. Hands-free often gets less reliable when you are tense, cold or deeper. Keep a hand near your nose until you trust it.
Control your speed. Pulling yourself down a line in free immersion lets you go as slowly as you like while you test it.

Many divers end up with a hybrid: hands-free for the easy metres, a light Frenzel when it gets harder, and a mouthfill for real depth.

Safety: Learn BTV on land and in shallow water first, never by testing it on a deep descent, and always with a buddy watching. If your ears hurt, stop and come up. And if you hear your own voice or breathing booming in your ears much of the time, that is a different condition, a tube that stays open, and worth discussing with an ENT.

If it never clicks

That’s fine. A solid Frenzel will take you as deep as most recreational freedivers ever want to go, and almost everyone can learn it.

The practice isn’t wasted either. Even a partial version helps: many divers find that lifting the soft palate as they do a Frenzel lets the tubes open with less pressure, which means gentler equalising and less air used. Some people pick up BTV years later, long after they stopped trying. Some never do. Nobody checks at the bottom of the line.

How to practise it over the next month

Weeks 1 and 2: the swallow, yawn and mirror drills, two or three minutes, three times a day. You are only trying to notice the click.
Week 3: the light-Frenzel-plus-lift drill, reducing the tongue pressure a little each session.
Week 4: test it in the pool, feet-first, with a buddy, keeping your hand on your nose as backup.

Write down what you feel after each session, even if it is nothing. Patterns show up over weeks, not days. An online community for Indian freedivers is on its way here at freediving.in, so stay tuned.

Frequently asked questions

What does BTV stand for in freediving?

BTV is short for béance tubaire volontaire, French for voluntary tubal opening. It describes opening the Eustachian tubes on purpose using the muscles of the soft palate and throat, without pinching the nose or pushing air from the lungs or mouth. You may also see it called hands-free or no-hands equalisation.

Is hands-free equalisation better than Frenzel?

Not better, just different. It is convenient, takes very little effort and frees both hands, which some divers like for streamlining. But it is harder to learn, not everyone can do it, and many very deep freedivers have equalised with Frenzel and mouthfill throughout their careers. Treat it as a bonus skill rather than a goal.

Is the rumbling sound in my ears the same as BTV?

Usually not. Many people can make a low rumbling sound by tensing a tiny muscle inside the middle ear, the tensor tympani. That muscle tightens the eardrum but doesn't open the Eustachian tube, so it doesn't equalise anything. A genuine tube opening is more often felt as a click, a crackle or a brief sense of your ears opening up.

Can you equalise just by swallowing?

Swallowing opens the tubes briefly, which is why it helps on aeroplanes and in very shallow water. On a freedive it is awkward: you have little saliva, swallowing head-down feels unnatural, and near the surface you would need to do it every metre or so. It is, though, a useful clue to the movement that BTV is built on.