The United States is sending an undersea navy drone capable of exploring waters nearly 15,000 feet (5,000 meters) deep to potentially help search for any sunken wreckage of Malaysia Airlines Flight MH370, the Pentagon said Monday.

The U.S. disclosure that it is pre-positioning the sonar-equipped Bluefin autonomous underwater vehicle in Australia came hours after Malaysia announced that the jetliner, which disappeared over two weeks ago, had crashed in the southern Indian Ocean.

All 239 people on board are presumed dead, airline officials said.