Underwater diving.
D003665:Decompression Sickness / Q000209:etiology; D004242:Diving / Q000009:adverse effects*; D004618:Embolism, Air / Q000209:etiology*; D006801:Humans; D002542:Intracranial Embolism and Thrombosis / Q000209:etiology; D011655:Pulmonary Embolism / Q000209:etiology