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Dive early to get under large waves. Adjust your breathing and hold your breath when necessary. Extend your body horizontally under the wave. Wear surfing goggles. Practice diving under small or flat waves. Dive under supervision.
Some waves are too big to swim through and should be avoided by diving under them. Dive when about you are about 5 to 6 feet (1.5 to 1.8 m)  away from the approaching wave to give yourself enough time to get under it. Dive approximately 3 to 4 feet (0.91 to 1.22 m) under the wave, swim forward as much as you can under the wave and emerge the other side. Unpredictable waves will mean sudden bursts of water hitting you head on, from behind, or on the side. Adjust your breathing as much as possible by turning your head to take a breath whenever you need to. If a wave comes too quickly to take a clear breath, hold your breath to keep from swallowing or inhaling water. Diving under a wave does not simply mean ducking under it, but submerging your entire body and navigating underneath it until it passes. Once you have dived under the surface of the water, keep your body in a horizontal position as you swim underwater. This will ensure that you don't come up to soon and get knocked back by the wave. While wearing safety goggles may not look cool at the beach, it is the best way to see clearly underwater when diving and to navigate yourself safely under waves. If you have vision problems, they will also allow you to wear prescription contacts without the risk of losing them or getting an infection. Purchase surfing goggles at a surf shop or online. You can also purchase special surfing goggles with prescription or polarized lenses. Before attempting to dive under large waves, it is best to get a feel for the process and learn how to build momentum and hold your body. Practice on small or flat waves in a small cove before moving onto big, ocean waves. Ask local surfers for advice about where to go to make sure you don't practice in a spot with hidden dangers, like strong riptides, large rocks, or heavy reef. It is important to have help available to you in the event of an emergency when you are getting used to diving under waves. Practice diving in an area that is supervised by a surf lifeguard, in a spot that is in sight of the on-duty lifeguard's watch station. Alternatively, enlist the help of a private instructor or experienced surfer who is trained in first aid.