After a long pause to survey a huge area of Indian Ocean seafloor, investigators have resumed the active search for answers in one of aviation's greatest mysteries. The GO Phoenix search vessel has begun pulling a sonar device along the seafloor in an attempt to finally find Malaysia Airlines Flight 370, which vanished without a trace on March 8 of this year, reports the Wall Street Journal. Two more ships will soon join the search in the remote part of the southern Indian Ocean that investigators believe is the final resting place of the plane and its 239 passengers and crew.
"We're not searching for a needle in a haystack, we're still trying to define where the haystack is," an Australian military official said in March, at the start of a huge international search for the plane. But now, the chief of the Australian agency leading the search says they're cautiously optimistic that the plane will be found in this phase of the search, though it could take up to a year. "What we'd say is we've probably limited it to a small number of haystacks, and we have very good techniques for detecting needles in those haystacks," he tells CNN. "We have high confidence that if we've got the right haystack, we'll find the needle in it." (Read more Flight 370 stories.)