Pulmonary barotrauma and decompression sickness are serious complications of scuba diving, caused by an inappropriate ascent. For those diving abroad, a strict surface interval requirement for flying after diving has been recommended in the U.S. Navy Diving Manual. We herein report a rare case, that of an experienced scuba diver who had severe dyspnea on an international flight home after a diving vacation abroad. Repeated ambient pressure change during 2 flight transfers led a diving complication becoming an impending tension pneumothorax at the airport terminal. The patient recovered well after tube thoracotomy and blebectomy.