The search for Malaysia Airlines Flight 370 has largely turned up more mysteries than answers. While the aircraft, which was carrying 239 passengers, is believed to have crashed far off course in the Indian Ocean around eight hours after it departed from Kuala Lumpur to Beijing, there was no evidence of its wreckage there even a month on after the disappearance. Instead, investigators have had to rely on radio pings and information from radar to track MH370s unexpected course.