Sequenzial Frenzel

Advanced equalization techniques.

How to dive beyond your expiratory limit: the Sequential Frenzel.


The Sequential Frenzel is an advanced equalization technique.

It is a maneuver that involves managing a useful quantity of air to be able to compensate beyond the depth that identifies our expiratory limit.  At this depth, which is usually around 25 - 30 meters, in fact we are no longer able to transfer the air from the lungs to the oral cavity and therefore the traditional Frenzel can no longer be used.

The Sequential Frenzel can be divided into three main points:

  • load;
  • one or more equalizations using the block T, Ca or H;
  • Removal of the blockage, lowering of the foot of the tongue and a new compression.


Load: the load suitable for the sequential Frenzel is the load M. The air must be moved from the lungs to the upper airways using a lip block so as to store it between the tongue and palate and in the cheeks. The air shifting can be done either with the abdominal contraction or through the reverse packing. At this point the glottis is sealed and the abdominals relax so as not to lose precious air and to avoid the squeeze phenomena (read Equalization in apnea: the things to know and the errors to avoid).

Equalizations: we use the Traditional Frenzel by independently exploiting one of the blocks (T, Ca, or H) and compressing the air between the tongue and the palate until this reserve is finished.

Block Removal: By keeping the glottis closed we remove the block and completely lower the foot of the tongue. We then move a part of the air that is stored in the cheeks towards the area between the tongue and the palate and isolating this volume again, we continue to perform two or three equalizations by repeating this operation until the entire reserve of air that we had moved during the load is not exhausted.