Chiara | Freedive Instructor on Instagram: "Hands Free Freediving Equalization 👀 👃 To properly perform the Frenzel equalization technique (or Valsava), freedivers need to pinch their nose. This can be done using their hand or a nose clip (commonly used for depth training and in freediving competitions). 👂By pinching their nose, the freediver is able to block the pressurized air from escaping out of their nostrils (so the air can go to their Eustachian tubes instead to equalize the pressure!)