Mouthfill Freediving Course – 4000thb (appx 110USD)

LOGO3-Final_11Duration: 2 Days (1 Day Course + 1 Training Day)
Includes: Lunch, Pictures, Equipment
Requirements: SSI Level 2 or equivalent
Special Price for Masters: 1000thb


If you have a basic understanding of human physiology, you know that there are air spaces within the body. These are exposed to changes in pressure, you feel pressure changing as you move from low to high altitude and vice versa, and you’ll also feel pressure changing when you are scuba diving or freediving. The spaces that are most at risk of damage are those in your facial cavity and ears; unless you compensate for the intense pressure changes that happen during diving, you can suffer from pressure related injuries known as barotrauma. The most popular and advanced technique to achieve greater depth in Freediving is the mouthfill.



This is a 2 days course aiming to teach how to do a mouthfill and using it efficiently during deep dives. This course is suitable for freedivers who are mentally and physically ready for depth but missing the deep equalization knowledge and practice. This course include:

2 dive sessions (3 hours each) during which the freediver will master the freediving skills:

  • Exhale diving
  • Mouthfill practiced in combination with exhale and inhale diving

1 theory session during which you will be explained in details:

  • Mechanics of the main equalization techniques
  • Theory behind the mouthfill mechanics and how to perform a full efficient mouthfill
  • Main problems freedivers accounter during the first approach with this technique and what to do to overcome each of them

If you have already some experience in deep diving and mouthfill practice, but make the usual mistakes such as losing air, bad control of air, diaphragme tension, run out early etc … then this Freediving training is for you.



VASALVA TECHNIQUE – Antonio Valsalva recorded middle ear pressurization in the 1700s. This simple equalization method is named in his honor. To use it, pinch your nose, close your mouth, and blow air from your lungs into your head space to force air into your middle ear. This technique works to depths of up to 30 meters; at greater depths, you will not have enough air in your lungs to use it. You will practice Vasalva and built a better understanding of this technique’s limit.

FRENZEL TECHNIQUE – Named after a Luftwaffe commander who developed this technique for World War II bomber pilots. It is accomplished by closing off the vocal cords, pinching your nostrils, and attempting to make a “guh” or “k” sound. This will elevate the back of your tongue and lift the Adam’s Apple, which in turn pushes air up into your middle ear. The Frenzel Maneuver is effective at depths of up to 40-50 meters but the risk of lung squeezes is pretty high. After doing 6-10 equalizations your mouth will be empty and you will need to reverse pack to bring some air back up. Competitive Freedivers don’t use Frenzel since Mouthfill equalization has been discovered.

TOYNBEE TECHNIQUE – In the Toynbee Manuever, the muscles at the back of the throat pull the Eustachian tubes open. To accomplish this, pinch your nostrils and swallow. You will hear a clicking or crackling noise. Like the Frenzel maneuver, the Toynbee maneuver works at depths beyond 30 meters and can be repeated.

VTO TECHIQNUE – Also known as the BTV maneuver, the VTO maneuver involves “Voluntary Tubal Opening” (Beance Tubaire Volontaire in French). It is less reliable than other methods; in fact only about 30% of those who try it are able to do it. In this equalization method, the soft palate muscles are contracted while muscles in the upper throat are used to pull the Eustachian tubes open. Its mechanics are somewhat like yawning with one’s mouth closed.

WET TECHNIQUE – A maneuver in which water is allowed to flood the sinuses, the Wet Equalization Maneuver is chiefly used by professional freedivers. It is challenging as there is an increased risk of drowning, and it takes correct training and practice to accomplish it. Do not try this method without appropriate instruction.

MOUTHFILL TECHNIQUE: is not a new equalization method, the mouthfill is a supportive technique that makes you able to equalize with Frenzel equalization below you RV-break point. The point where your lungs have been compressed to their minimum volume (residual volume), from which valsalva equalization is impossible. It basically means that you fill your mouth with air from the lungs before this point and then use this air to equalize with. The epiglottis must remain closed all the time. This technique was first put on paper by Eric Fattah. The mouthfill can be done with a push from the torso/lungs, or better sucked up with a negative pack. They can be combined and that lets you draw the mouthfill somewhat later, but that is always risky. The best technique is to constantly top up until you feel you may not be able to do it fully again.

During this course, equalization techniques may be combined and personalized, the important thing is to develop the ability to equalize comfortably and to know what will work best for you during freediving. If you scuba dive or freediver, you’ll find that you can use these same methods with reliability, increasing your safety and comfort throughout each and every dive.

Fun dive banner 8


Contact Blue Immersion Freediving