Photo: AP 
 
 The development came more than two days after Ocean Shield first detected the month-long search's most promising lead: two acoustic events on Saturday. Hide Caption 13 of 106 Photos: The search for Malaysia Airlines Flight 370 106 photos The search for Malaysia Airlines Flight 370 – A Royal Australian Air Force AP-3C Orion, on a mission to drop sonar buoys to assist in the search, flies past the Australian vessel Ocean Shield on April 9. Hide Caption 17 of 106 Photos: The search for Malaysia Airlines Flight 370 106 photos The search for Malaysia Airlines Flight 370 – A towed pinger locator is readied to be deployed April 7 off the deck of the Australian vessel Ocean Shield. Hide Caption 99 of 106 Photos: The search for Malaysia Airlines Flight 370 106 photos The search for Malaysia Airlines Flight 370 – A relative of two missing passengers reacts at their home in Kuala Lumpur on March 8. 03:57 PLAY VIDEO 
 
 "I believe we are searching in the right area but we need to visually identify wreckage before we can confirm with certainty that this is the final resting place of MH370," Houston said. "There's no second chances," he said. Authorities analyzed the signals picked up Saturday and determined they were not of 
 
 natural origin and was likely sourced from specific electronic equipment. Photo: AP 
 
 Mr Houston said expert data analysis on previously detected signals had found they were not of natural origin, further boosting hopes of a breakthrough. He said the first two pings - detected on April 5 at 4.45pm and at 9.27pm Perth time - had been analysed by the Australasian Joint Acoustic Analysis Centre, based at HMAS Albatross in Nowra, on the NSW south coast. "It looks like the signals we picked up recently have been much weaker than the original signals we picked up ... we're either a long away from it or in my view more likely the batteries are starting to fade." Four reasons to believe; six reasons to doubt 
 
 Discovery of possible 'locator beacon' pulses gives hope 
 
 Wednesday's search includes up to 11 military planes, four civilian aircraft as well as 14 ships -- three of which, Australia's Ocean Shield further north and the British HMS Echo and Chinese Haixun 01 to the south -- will be focusing underwater. Advertisement 
 
 Retired air chief marshal Angus Houston, the head of the search's Joint Agency Co-ordination centre, announced the "promising" development during a press conference in Perth on Wednesday afternoon. The Australian Defence Vessel Ocean Shield, towing a US pinger locator, detected two sets of pings, on Tuesday afternoon and then again about five hours later. The signal detected on Tuesday afternoon was held for about five minutes and 32 seconds; followed by a second signal on Tuesday night, which was held for seven minutes. Although authorities have previously said the autonomous underwater vehicle Bluefin-21 would be dropped to the ocean floor once they received a third ping, they have yet to deploy the asset. Next steps in underwater search 
 
 Pings without wreckage 'befuddling' 
 
 The absence of wreckage near these detected signals leaves some skeptical, worried that the Chinese and Australian ship's finds could be yet another false lead in an investigation that's been full of them.
– Australian officials have sounded a fresh note of confidence in the search for Malaysia Airlines Flight 370, saying they've reacquired underwater signals following a lapse into silence. Search chief Angus Houston says an Australian navy vessel detected two sets of pings yesterday in the same area that signals were detected over the weekend, reports the Sydney Morning Herald. "I'm now optimistic that we will find the aircraft, or what is left of the aircraft, in the not too distant future—but we haven't found it yet, because this is a very challenging business," Houston told reporters. The signals are getting weaker, which could be a sign that searchers are getting further away, or, more likely, a sign that the data recorder batteries are starting to fade, explained Houston. He says they have delayed deploying the autonomous underwater vehicle Bluefin-21 to search for wreckage because with time running out, they don't want anything to get in the way of the signals. In another promising development, authorities have analyzed the pings detected over the weekend and confirmed that they came from electronic equipment, with signals consistent with those of flight data recorders, CNN reports.