CANBERRA, Australia (AP) — A robotic submarine scanning the Indian Ocean floor for the missing Malaysia Airlines jet will extend the area of its current search, which will end soon with no clues of the Boeing 777 found yet, authorities said Sunday.

The U.S. Navy’s Bluefin 21 has been creating a three-dimensional sonar map of the ocean floor for more than two weeks near where signals consistent with airplane black boxes were heard on April 8.