SDI Open Water Scuba Diver Practice Exam 2026 – Complete Test Prep

The method cited as blowing out through your mouth is indeed a legitimate technique for clearing a mask, as it helps to expel water that has entered the mask. When your mask has water inside, one common approach is to exhale gently through your nose while simultaneously pressing up on the mask's top to force the water out from the bottom. This method creates a pressure difference that efficiently clears the water without introducing additional challenges.

In contrast, the other methods may not be as effective. Tilting your head back can cause water to flow into the mask instead of allowing it to clear effectively, while pushing the mask away from your face may not only fail to remove water but could also create a situation where the mask comes off entirely. Taking a deep breath and looking up can help to some degree, but it often involves a combination of techniques for optimal results.

Each of these methods achieves the same goal, which is to ensure a clear line of sight while underwater, but blowing out through your mouth is specifically effective and frequently taught as a primary technique.