The leader of Australia’s search operation to finding missing Malaysia Airlines flight 370 said on Monday that a vessel had picked up signals consistent with those of an airplane black box. This is by no means a confirmation of the plane’s location, but, Angus Houston said, "Clearly this is a most promising lead, and in the search so far it’s probably the best information we’ve had.”

The pings were heard on two separate occasions on Sunday. The first lasted more than two hours, the second only 13 minutes. If crews can pinpoint the location of the sound, an autonomous vehicle will be submerged into the water to search further, though Houston cautioned that the water is extremely deep — more than 4,500 meters.

Below is a handout from AMSA illustrating the search's progress since March 18.