It is rarely traversed by air or sea, and anything lost there may never be found. That includes Malaysia Airlines Flight 370.

 

But those scouring a remote swath of ocean west of Australia received tantalizing clues this week, including new radar data about the plane’s velocity. The data, gleaned from radar between the South China Sea and the Strait of Malacca, suggests MH370 was traveling faster than previously believed, the Australian Maritime Safety Authority said. That means it would have run out of fuel sooner. The agency called this new information “the most credible lead to where debris may be located.”

 

The new lead prompted a sudden change in focus to an area 685 miles northeast of where everyone had been searching. They’d spent much of the week scouring an area 1,600 miles west of Perth, Australia, after satellite images taken Sunday by Airbus Defence and Space and Monday by Thailand’s Geo-Informatics Space Technology Development Agency revealed what might be a debris field.