Malaysia Flight 370 Disappearance Anniversary Brings New Details

As many gather to remember the world's biggest aviation mystery, investigators release new details on the case.
2:19 | 03/08/15

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Transcript for Malaysia Flight 370 Disappearance Anniversary Brings New Details
events coming up. And the one-year anniversary of the disappearance of Malaysia flight 370. This mother, the face of sorrow, losing her son even harder because the plane has never been found. On this anniversary, new details about the pilot and crew. And a new problem we're just hearing about. Here's bob woodruff. Reporter: It's been a year since flight 370 disappeared. Still no signs of the 239 people onboard. Today in Malaysia, vigils. While here in beijing, families showing their growing frustration. Continue the search, they said. Give us our relatives back. More than 150 of the passengers were Chinese. I was there when the families' anger was beginning to rise. Out of control here. I just can't even believe this. After 12 months of searching, no real clues. Just some new details in a report released yesterday. Apparently the battery in the underwater locator beacon had expired more than a year before the plane vanished. So it may not have been working. As for the pilot or copilot, no indication they had any responsibility for bringing the plane down. All that is known, at 12:41 A.M. It takes off from Kuala Lumpur. 239 people on board. 2:40 A.M., it's cruising, losing radar contact. As for the search, it's cost close to $100 million. So far, only about 40% of the ocean floor they intended to cover has been completed. It's unclear how long the search will continue. We owe it to the families of the dead. We owe it to the traveling public to do whatever we reasonably can. Reporter: Many of the families don't believe that their loved ones died for sure. ? In January, the Malaysian government declared the passengers dead. They say they need absolute proof before they believe it. And Tom, I should let you know, at the demonstration today in beijing, the police were there just to keep everyone under their control. Bob you -- thank you.

This transcript has been automatically generated and may not be 100% accurate.

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