Nigerian had to swim out of his air pocket twice to get diver's attention
                                
                                
                                    (Newser) -
                                    He had survived three days in an upside down tugboat at the  bottom of the Atlantic Ocean , and then he saw lights in the water. A diver was coming. Rescue seemed imminent for Harrison Odjegba Okene. But then the lights disappeared. Desperate, Okene swam through pitch-dark waters in the sunken...