investigation reveals confusion in the hours after the flight 777 disappeared . After it , air traffic controller confirmed his supervisor had been asleep . Use of underwater locator beacon for the data recorder had expired . deputy commander Liow Tiong Lai said an urgent probe was under way .
Report reveals confusion in the hours after the Boeing 777 disappeared . After it vanished air traffic controller said his supervisor had been asleep . Battery of underwater locator beacon for the data recorder had expired . Transport Minister Liow Tiong Lai said an urgent probe was under way .