Malaysia Flight 370: Searchers race to try to trace sounds detected in ocean [video=youtube_share;FlRHIXlqmpM]http://youtu.be/FlRHIXlqmpM[/video] A French diving expedition is underway. A diver, Gauthier, heads down in an Atmospheric Diving Suit to investigate a target his crew thinks is the remains of a plane from a lost squadron from World War II. He spots the plane and reads the call numbers and the name "Drop Dead Red", verifying this is the plane they are looking for. He then hears pounding and investigates the canopy. He finds a man still alive, in an air pocket, pounding the glass from inside the canopy; Gauthier stares in shock as the man's eyes glaze over with a black, inky haze. After losing radio contact, the crew manages to haul up Gauthier, who is disoriented. He blinks his eyes and they go black, like the man from the plane. Kuala Lumpur, Malaysia (CNN) -- Search teams are racing to figure out if a number of underwater sounds detected in the southern Indian Ocean came from a flight recorder from Malaysia Airlines Flight 370. Time is against them, as the batteries powering the missing plane's devices that send out pings are expected to expire in the coming days. The desperate efforts to trace the signals came as new details emerged about the missing plane's likely path on the night it vanished. A senior Malaysian government source told CNN that Flight 370 flew around Indonesian airspace after it dropped off Malaysian military radar. The plane may have been intentionally taken along a route designed to avoid radar detection, the source said. In the search for the plane in the Indian Ocean, the Chinese patrol ship Haixun 01 picked up two signals, one on Friday and another on Saturday, that were only 2 kilometers (1.25 miles) apart, authorities said. "This is an important and encouraging lead, but one that I urge you to continue to treat carefully," Angus Houston, the head of the Australian agency coordinating search operations, said Sunday. The electronic pulses were consistent with those emitted by pingers on an aircraft's flight data and voice recorders, he said, but haven't been verified as coming from Flight 370. Sounds travel long distances underwater, he said, making it difficult to ascertain their sources. If detectors were near a pinger, they would pick up the signal for a more sustained period. Houston also said that search authorities were informed Sunday that the Ocean Shield, an Australian naval vessel equipped with sophisticated listening equipment, has detected "an acoustic noise" in another area of the ocean. The signals are the latest leads in a huge, multinational hunt for Flight 370, which disappeared almost a month ago over Southeast Asia with 239 people on board. Investigators have so far been unable to say why the plane flew far off course or where it ended up.