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(CNN) -- The pulses that an Australian navy ship detected over the
weekend from a remote location in the Indian Ocean have not been
picked up since, but authorities are not letting that deter their
search for Malaysia Airlines Flight 370.
"We have at least several days of intense actions ahead of us,"
Australian Defense Minister David Johnston told reporters Tuesday.
"We're throwing everything at this difficult, complex task."
Investigators hope the signals were from locator beacons that were
attached to the data and voice recorders that were stored in the tail
of the Boeing 777-200ER when it disappeared from radar screens
on March 8.
Buoyed by the hope that they're closing in on the beacons, they
reduced the search area Tuesday.
Their current focus is 30,000 square miles (more than
77,500 square kilometers) of the Indian Ocean, about
1,400 miles (2,250 kilometers) northwest of Perth. That's
about a third of the size of the previous search zone.
"Instead of looking at an area the size of Texas, we're now
looking in an area the size of Houston," aviation expert
Geoffrey Thomas told CNN.
Time, however, is looming as a factor.
The batteries powering the beacons, which are designed
to emit signals when submerged in salt water, are certified
to last 30 days.
Tuesday marks day 32.
Part of complete cov erage on
Malaysia Airlines Flight 370
Malaysia Flight 370: 'We're throwingeverything at this difficult, complex task'By Ed Payne and Catherine E. Shoichet, CNN
updated 9:09 AM EDT, Tue April 8, 2014
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STORY HIGHLIGHTS
Authorities reduce the size of
the search area
Some say batteries pow ering
the plane's pingers could last
longer than 30 days
"I am still hoping for a miracle to
happen," a passenger's
husband says
Hear possible 'ping' detected in search
Photos: The search for Malaysia Airlines
Flight 370
Authorities hunting MH370 face
days of intense searching to
locate its "black boxes" before
their batteries die.
'Pinger signals' not heard for daysupdated 9:09 AM EDT, Tue April 8, 2014
Almost a month after Flight 370
disappeared, searchers say
pulse signals detected in the
Indian Ocean provide the best
hope so far.
More pings raise more questionsupdated 6:21 PM EDT, Mon April 7, 2014
CNN's Matthew Chance gives
us the latest in the search for
MH370 in the Indian Ocean.
Could the pings be from MH370?updated 9:34 PM EDT, Mon April 7, 2014
The pings detected by an
Australian navy ship crew in
the southern Indian Ocean
have renew ed hopes.
Underwater search: Next stepsupdated 8:12 AM EDT, Mon April 7, 2014
Did searchers make the
discovery w e've all been
w aiting for? Here are four
reasons to feel hopeful -- and
six reasons w hy w e shouldn't.
Did they find the black boxes?updated 10:15 PM EDT, Sun April 6, 2014
The discovery of a pulse signal
in the search for Malaysia
Airlines Flight 370 marks yet
another potential breakthrough.
Search timelineupdated 5:44 AM EDT, Mon April 7, 2014
The pinger batteries are not
guaranteed to w ork for more
than 30 days, and it's already
been about a month since the
plane w ent missing.
What if the pingers die?updated 7:23 AM EDT, Sat April 5, 2014
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Experts have said the batteries could last longer if they
were fully charged when the plane disappeared while
carrying 239 people on a flight from Kuala Lumpur,
Malaysia, to Beijing.
"We need to continue ... for several days right up to when
the point at which there's absolutely no doubt that the
pinger batteries will have expired," said retired Air Chief
Marshal Angus Houston, the chief of the Australian
agency coordinating the search.
Retired Royal Air Force Lt. Col. Michael Kay predicted the
search for the pingers would continue for another week
and a half.
"We know that the batteries can last up to 40 days," Kay
told CNN. "If I was Angus Houston, I would be putting the search out
to at least 42, 43 (days) to make absolutely sure that the batteries
had failed."
The race against time is the "Number one challenge" searchers
face, U.S. Navy Cmdr. William Marks told CNN.
"We haven't quit since we initially heard these signals," he said.
"We've been going continuously around the clock and we haven't
been able to reacquire them."
Searchers are still scouring the waters, but their optimism is "more
cautious" now, he said. "As hours pass," he said, "our optimism is
fading away, ever so slightly."
What happens after the Malaysian plane's pingers die?
Major challenges
But the search area still presents major challenges.
The location is deep, and a cyclone that packed wind
speeds of more than 160 mph churned through the area
two weeks ago, when crews were focused elsewhere in
the Indian Ocean. In doing so, it would have further
spread any debris.
"This was an area that looked like a washing machine in
the first place, but now we know it was even worse than
that," CNN meteorologist Chad Myers said.
But Tuesday's weather was calm, with no major systems
near where the pings were detected, said CNN
meteorologist Sherri Pugh.
Four reasons to believe; six reasons to doubt
Consistent signals
Cheers erupted Saturday when the team aboard
Australia's Ocean Shield first detected a possible signal
from one of the plane's recorders.
The Australian ship is equipped with two key pieces of
U.S. equipment to scan the water for signs of the plane: a
towed pinger locator and a Bluefin-21 underwater vehicle.
The first detection continued for more than two hours; the
second for about 13 minutes.
The signals, detected about 1,750 kilometers (1,100
miles) northwest of Perth, Australia, were consistent with
those sent by a flight data recorder and a cockpit voice recorder,
What you need to know about a black box
Up to 14 planes in search for Flight 370
Hiding in another plane's shadow ?
Tracking Malaysian gov't's mixed messages
MH370 families remember 1 month
Brother: It's hard to hold on to hope
A Chinese ship has detected a
pulse signal consistent w ith the
missing plane's black box
frequency. Still, experts
exercise caution.
Could the pings be a false alarm?updated 12:46 PM EDT, Sat April 5, 2014
The possibility of closure for
relatives of the passengers
and crew may have emerged
in the form of an unconfirmed
pulse signal.
Relatives cautiously waitupdated 5:53 AM EDT, Mon April 7, 2014
If the disappearance of MH370
caused a rif t in China-Malaysia
relations, the tw o countries
appear to have put it behind
them.
China and Malaysia maintain relationsupdated 9:26 PM EDT, Sun April 6, 2014
Jim Clancy runs dow n the big
questions surrounding how
technology and security could
help prevent another airline
mystery.
How to never lose another planeupdated 8:37 AM EDT, Wed April 2, 2014
After Flight 370, Malaysia
Airlines is emphasizing cockpit
security. We hear from aviation
experts Miles O'Brien, David
Soucie on CNN.
Airline pushes more securityupdated 5:17 PM EDT, Wed April 2, 2014
Malaysian off icials coordinating
the search have been battered
by criticism that they have
mishandled the investigation.
6 missteps in the investigationupdated 12:13 AM EDT, Wed April 2, 2014
Docked at the largest naval
base in Western Australia is a
ship w ith the w eight of the
w orld resting on the shoulders
of its 30-member crew .
Ocean Shield: A mission of hopeupdated 9:32 AM EDT, Tue April 1, 2014
The mother of passenger No.
63 aboard Flight 370 is unable
to come out of the shadow s of
her son's misdeed.
Mother of Iranian suffers in silenceupdated 8:11 AM EDT, Fri April 4, 2014
They w ere headed to Beijing
for their honeymoon. They,
along w ith 237 other people
aboard, never arrived.
The missing newlywedsupdated 7:27 AM EDT, Tue April 1, 2014
Instagram photos by CNN teamsupdated 12:00 AM EDT, Tue April 8, 2014
4/8/2014 Malaysia Airlines Flight 370: Pings not heard since weekend - CNN.com
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Houston said. They were heard in seawater about 4,500 meters
(14,800 feet) deep.
"The audible signal sounds to me just like an emergency locator
beacon," Houston said. "We are encouraged that we are very close
to where we need to be."
If the signals are heard again, searchers could deploy an
underwater drone to take photos to determine whether they do
indeed mean the discovery of the so-called black boxes. That
process could take more than a week.
"Until we have stopped the pinger search, we will not deploy the
submersible," Houston said. "We will not deploy it unless we get
another transmission in which we'll probably have a better idea of
what's down there."
Next steps in underwater search
Pulses detected
Teams are also still investigating pulses detected Friday and
Saturday by a Chinese ship about 600 kilometers (375 miles)
southwest of where the Ocean Shield is searching.
The signals detected by the Chinese weren't as sustained as those
picked up by the Ocean Shield, and the Chinese vessel's detection
gear isn't thought to be as advanced as the U.S. pinger locator.
Houston said Monday that they were probably separate events.
Some friends and relatives of passengers said they were keeping
their hopes in check.
"Until they physically locate the bulk of the plane with the black box
intact and passenger bodies, I won't believe it," said Sarah Bajc, the
partner of American passenger Philip Wood.
At a candlelight vigil in Beijing on Monday night, some relatives
sobbed and others bowed their heads.
"If the plane is there, it's there. We can't change it," the husband of
one passenger said. "But I am still hoping for a miracle to happen."
Timeline: Leads in the hunt for Malaysia Airlines Flight 370 weave
drama
Lucrative China-Malaysia relations not derailed by search for
MH370
Wife of Flight 370 passenger: 'I needed to know they were looking
for Pauly'
CNN's Tom Watkins, Jethro Mullen, Matthew Chance, David Molko, Will Ripley, Judy
Kw on, Ed Payne and Mitra Mobasherat and journalist Ivy Sam also contributed to this
report.
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