Underwater Vertigo

The most common cause of underwater vertigo is alternobaric vertigo, resulting from unequal pressure equalisation between the two middle ears. If one Eustachian tube is blocked (e.g., due to congestion), pressure in one ear may equalise slower or not at all, creating a pressure differential that stimulates the vestibular system unequally. This can be exacerbated by rapid ascent or descent. Other causes include caloric vertigo (cold water entering one ear canal, often from a leaky mask), inner ear barotrauma, or even visual disorientation in low visibility or featureless environments.

When vertigo strikes, the primary symptom is a strong sensation of spinning, either of oneself or of the surroundings. This can be accompanied by nausea, vomiting, dizziness, and rapid, involuntary eye movements (nystagmus). In severe cases, panic may set in, leading to unsafe behaviours like rapid ascent. Recognising these symptoms early is crucial for effective management and preventing further complications.

Preventing underwater vertigo largely revolves around ensuring proper ear health and effective equalisation techniques. Before diving, avoid diving if you have a cold, allergies, or an ear infection that might impair equalisation. Use decongestants cautiously and only if recommended by a doctor, as their effects can wear off underwater. Practise slow, gentle equalisation techniques (e.g., Valsalva, Frenzel) throughout your descent, starting before you feel pressure, and ensure both ears equalise simultaneously.

Maintain good buoyancy control and avoid rapid changes in depth. During a dive, if you feel disoriented, focus on a fixed object or your dive buddy, and signal your distress. If conditions are low visibility or dark, consider using a dive light to provide visual references. Proper mask fit is also important to prevent cold water from entering one ear canal.

Liveaboard diving often involves multiple dives per day and varied conditions, making prevention and awareness of vertigo especially important. Should you experience vertigo during a liveaboard dive, the immediate priority is to stop, orient yourself, and signal your buddy. If you are disoriented, hold onto a fixed object or your buddy, and try to equalise both ears gently. If the spinning sensation persists, close your eyes to remove conflicting visual input, which can sometimes help the inner ear to re-regulate.

If the vertigo is severe and you need to ascend, do so slowly and carefully, maintaining contact with your buddy. Once on the surface, inform the dive crew immediately. They are trained to assist and can provide medical attention if needed. Do not re-enter the water if you are still experiencing symptoms or feel unwell. Open communication with your liveaboard dive guide about any recurring issues will help them plan dives safely and support you effectively.

If you find yourself disoriented by vertigo underwater, the immediate and most crucial step is to remain calm and avoid panic. Signal to your dive buddy immediately, using the universal 'problem' or 'disorientation' signal. If possible, grab onto something stable, such as a reef (without damaging it) or your buddy, to regain a sense of equilibrium. Focus on your breathing, making it slow and steady.

Attempt to re-equalise your ears gently. If closing your eyes helps reduce the spinning sensation, do so briefly. If you are unable to resolve the issue and feel the need to ascend, do so slowly and under controlled conditions, ideally with your buddy's assistance. Maintain neutral buoyancy and monitor your gauges closely. Upon surfacing, alert the boat crew or dive master to your condition. Do not hesitate to sit out subsequent dives if you still feel any residual dizziness or discomfort, prioritising your safety.

Myth: Underwater vertigo only happens to new divers. Fact: While new divers might be more prone due to less refined equalisation techniques, experienced divers can also experience vertigo. Factors like congestion, ear infections, or even just a challenging equalisation day can affect anyone, regardless of experience.

Myth: If you get vertigo, you must have inner ear damage. Fact: Most cases of underwater vertigo (alternobaric or caloric) are temporary and do not indicate permanent inner ear damage. They are often due to temporary pressure imbalances or thermal differences. Inner ear barotrauma is a more serious, but less common, cause.

Myth: You can just power through vertigo and continue your dive. Fact: It is never advisable to ignore or 'power through' vertigo. Disorientation underwater is extremely dangerous and can lead to panic, rapid uncontrolled ascents, or loss of your buddy. Always signal distress, stabilise, and ascend slowly if symptoms persist.