Authorities say they have new hope of finding missing Malaysian Airlines flight 370.

U.S. Navy equipment has picked up two more underwater signals that could be coming from the plane's black boxes.

Authorities say they're optimistic since pings were heard in the same area of the Indian Ocean last week.

"I believe we are searching in the right area, but we need to visually identify aircraft wreckage before we can confirm with certainty that this is the final resting place of MH-370," said Angus Houston with the Joint Agency Coordination Center.

More than two dozen planes and ships are searching a 29,000 square mile area. Officials say they're in a race against time because these latest pings were weaker than signals heard before.