China ship detected ‘pulse signals’ are consistent with MH370 aircraft black box

This photograph taken on July 24, 2013 shows crew members standing on the deck of the vessel "Haixun 01"

Chinese patrol ship picks up signal in Indian Ocean

China’s patrol ship, the Haixun 01, has picked up pulses with a frequency of 37.5 kilo hertz in the ...

MH370 search: Signal detected 'consistent' with black box, says Australian ex-military chief

Chinese aircraft spots new floating objects in search of MH370

A Chinese air force plane searching for missing Malaysian passenger jet MH370 spotted a number of white floating objects in the search area Saturday.

Ships sent to verify suspicious pulse signal Xinhuanet 2014-04-05

Verification underway after Chinese ship detects suspicious ... Xinhuanet 2014-04-06

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Planes and ships continue criss-cross search grid fo flight MH370 in Indian ocean | Watch News Videos Onlinehttp://globalnews.ca/video/1252652
 
PERTH, Australia — A Chinese ship involved in the hunt for the missing Malaysian jetliner reported hearing a “pulse signal” Saturday in southern Indian Ocean waters with the same frequency emitted by the plane’s data recorders, as Malaysia vowed not to give up the search for the aircraft.

The Australian government agency coordinating the search for the missing plane said early Sunday that the electronic pulse signals reportedly detected by the Chinese ship are consistent with those of an aircraft black box. But retired Air Chief Marshal Angus Houston, the head of the search coordination agency, said they “cannot verify any connection” at this stage between the electronic signals and the missing Malaysia Airlines Flight 370.

Military and civilian planes, ships with deep-sea searching equipment and a British nuclear submarine scoured a remote patch of the southern Indian Ocean off Australia’s west coast, in an increasingly urgent hunt for debris and the “black box” recorders that hold vital information about Malaysia Airlines Flight 370′s last hours.

After weeks of fruitless looking, the multinational search team is racing against time to find the sound-emitting beacons in the flight and cockpit voice recorders that could help unravel the mystery of the plane’s fate. The beacons in the black boxes emit “pings” so they can be more easily found, but the batteries only last for about a month.

A Chinese ship that is part of the search effort detected a “pulse signal” in southern Indian Ocean waters, China’s official Xinhua News Agency reported. Xinhua, however, said it had not yet been determined whether the signal was related to the missing plane, citing the China Maritime Search and Rescue Center.

Xinhua said a black box detector deployed by the ship, Haixun 01, picked up a signal at 37.5 kilohertz (cycles per second), the same frequency emitted by flight data recorders. Malaysia’s civil aviation chief, Azharuddin Abdul Rahman, confirmed that the frequency emitted by Flight 370′s black boxes were 37.5 kilohertz and said authorities were verifying the report.

Earlier Saturday, Xinhua reported that a Chinese military aircraft searching for the missing aircraft spotted “white floating objects” not far from where the electronic signals were detected.

Finding floating wreckage is key to narrowing the search area, as officials can then use data on currents to backtrack to where the plane hit the water, and where the flight recorders may be.

Houston said the Australian-led Joint Agency Coordination Centre heading the search operation could not yet verify the Chinese reports and had asked China for “any further information that may be relevant.” He said the Australian air force was considering deploying more aircraft to the area where the Chinese ship reportedly detected the sounds.

“I have been advised that a series of sounds have been detected by a Chinese ship in the search area. The characteristics reported are consistent with the aircraft black box,” Houston said, adding that the Australian-led agency had also received reports of the white objects sighted on the ocean surface about 90 kilometers (56 miles) from where the electronic signals were detected.

“However, there is no confirmation at this stage that the signals and the objects are related to the missing aircraft,” Houston said.

Still, Malaysia’s defense minister and acting transport minister, Hishammuddin Hussein, was hopeful. “Another night of hope – praying hard,” he tweeted in response to the latest discoveries.

There are many clicks, buzzes and other sounds in the ocean from animals, but the 37.5 kilohertz pulse was selected for underwater locator beacons on black boxes because there is nothing else in the sea that would naturally make that sound, said William Waldock, an expert on search and rescue who teaches accident investigation at Embry-Riddle Aeronautical University in Prescott, Arizona.

“They picked that (frequency) so there wouldn’t be false alarms from other things in the ocean,” he said.

Honeywell Aerospace, which made the boxes in the missing Malaysia Airlines plane, said the Underwater Acoustic Beacons on both the flight data recorder and cockpit voice recorder operate at a frequency of 37.5 kilohertz plus or minus 1 kilohertz.

Waldock cautioned that “it’s possible it could be an aberrant signal” from a nuclear submarine if there was one in the vicinity.

If the sounds can be verified, it would reduce the search area to about 10 square kilometers (4 square miles), Waldock said. Unmanned robot subs with sidescan sonar would then be sent into the water to try to locate the wreckage, he said.

John Goglia, a former U.S. National Transportation Safety Board member, called the report “exciting,” but cautioned that “there is an awful lot of noise in the ocean.”

“One ship, one ping doesn’t make a success story,” he said. “It will have to be explored. I guarantee you there are other resources being moved into the area to see if it can be verified.”

The Boeing 777 disappeared March 8 while en route from Kuala Lumpur, Malaysia, to Beijing with 239 people aboard. So far, no trace of the jet has been found.

Hishammuddin, the Malaysian defense minister, told reporters in Kuala Lumpur that the cost of mounting the search was immaterial compared to providing solace for the families of those on board by establishing what happened.

EPA/ABIS JULIANNE CROPLEY/AUSTRALIAN DEPARTMENT OF DEFENCEA handout picture made available by the Australian Department of Defense (DOD) on 02 April 2014 shows the HMAS Success searching for the missing Malaysia Airlines Flight MH370, at sea in the southern Indian Ocean, 31 March 2013. 

“I can only speak for Malaysia, and Malaysia will not stop looking for MH370,” Hishammuddin said.

He said an independent investigator would be appointed to lead a team that will try to determine what happened to Flight 370. The team will include three groups: One will look at airworthiness, including maintenance, structures and systems; another will examine operations, such as flight recorders and meteorology; and a third will consider medical and human factors.

The investigation team will include officials and experts from several nations, including Australia – which as the nearest country to the search zone is currently heading the hunt – China, the United States, Britain and France, Hishammuddin said.

Officials have said the hunt for the wreckage is among the hardest ever undertaken, and will get much harder if there are no confirmed debris sightings and the beacons fall silent before they are found.

If that happens, the only hope for finding the plane may be a full survey of the Indian Ocean floor, an operation that would take years and an enormous international operation.

Hishammuddin said there were no new satellite images or data that can provide new leads for searchers. The focus now is fully on the ocean search, he said.

Two ships – the Australian navy’s Ocean Shield and the British HMS Echo – carrying sophisticated equipment that can hear the recorders’ pings returned Saturday to an area investigators hope is close to where the plane went down. They concede the area they have identified is a best guess.

Up to 13 military and civilian planes and nine other ships took part in the search Saturday, the Australian agency coordinating the search said.

Because the U.S. Navy’s pinger locator can pick up signals to a depth of 6,100 meters (20,000 feet), it should be able to hear the plane’s data recorders even if they are in the deepest part of the search zone – about 5,800 meters (19,000 feet). But that’s only if the locator gets within range of the black boxes – a tough task, given the size of the search area and the fact that the pinger locator must be dragged slowly through the water at just 1 to 5 knots (1 to 6 mph).

Australia’s Houston acknowledged the search area was essentially a best guess, and noted the time when the plane’s locator beacons would shut down was “getting pretty close.”

The overall search area is a 217,000-square-kilometer (84,000-square-mile) zone in the southern Indian Ocean, about 1,700 kilometers (1,100 miles) northwest of the western Australian city of Perth.

-  Nick Perry and Eileen Ng, Associated Press
Ng reported from Kuala Lumpur, Malaysia. Associated Press writers Gillian Wong in Kuala Lumpur, Rod McGuirk in Canberra, Australia, Kristen Gelineau and Rohan Sullivan in Sydney, and Joan Lowy in Washington contributed to this report.

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Search for missing MH370 jet could turn on robot subs

This 2011 photo provided by Sylvain Pascaud shows the ship Alucia and the REMUS 6000 robot sub during the search for Air France Flight 447....

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Chinese tourists abducted by Philippine terrorists, to sour ties with China?

PERTH: Malaysia is not ruling out the possibility that the latest abduction case at a resort off Semporna was a deliberate act to sour the country’s relations with China, says Prime Minister Datuk Seri Najib Tun Razak.

He said the fact that one of those kidnapped was a Chinese national could complicate the situation further following the disappearance of MH370, which had mostly Chinese nationals on board.

“There may be those who are attempting to drive a wedge between China and us. They may be trying to take advantage of the situation,” Najib said after a bilateral meeting with his Australian counterpart Tony Abbott at the Commonwealth Parlia­mentary Office here.

Najib, however, believes ties with China will remain strong despite the kidnap incident.

Najib said Malaysia had sought the cooperation of Filipino authorities on the matter, while police were investigating how the incident could have happened.

A news portal had reported that rebel group Abu Sayyaf was responsible for the abduction.

Filipino military sources told Rappler.com that the two women were taken by six former Moro National Liberation Front (MNLF) members who had joined Abu Sayyaf.

In Kota Kinabalu, Sabah Chief Minister Datuk Seri Musa Aman has ordered that all available resources be directed towards solving the kidnapping case at a resort in Sem­porna.

He said the Eastern Sabah Security Command (Esscom) director-general Datuk Mohammad Mentek had briefed him on the kidnapping.

Kidnappers suspected to be Philippine militants

<< Video For the latest on the kidnapping, let´s go live to James Chau in the Malaysian capital Kuala L...

RM11.5mil the usual price for non-Filipino hostage

PETALING JAYA: The notorious Abu Sayyaf group believed to be responsible for the abduction of a Chinese and Philippine national in Sabah used to demand up to US$3.5mil (RM11.5mil) for the release of non-Filipino citizens, said a security analyst.

Prof Dr Aruna Gopinath who specialises in maritime security said the separatist group based at Basilan in the southern Philippines would typically charge a lower rate of three million pesos (RM219,000) for the release of Filipino citizens.

“The Abu Sayyaf are only interested in money and a ransom will have to be paid before they release their hostages,” she said.

Aruna said a Philippine reporter she knew was kidnapped by the group in 2011 and was held captive for 90 days.

“She met the Abu Sayyaf leaders in Basilan for an interview but was instead kidnapped by them, kept under guard in a house and given only water and two bananas three times a day.”

Aruna said a Philippine congressman eventually agreed to pay the ransom of three million pesos after which her friend was let go.

Another Moro Islamic Liberation Front (MILF) breakaway group that specialises in kidnapping is the Bangsamoro Islamic Freedom Fighters which Malaysian authorities must be alert for, said Aruna.

In a related development, the Associated Press quoted a Philippine intelligence official yesterday as confirming that the kidnapping was the work of the Abu Sayyaf group.

He said Abu Sayyaf leaders were angry because they were not brought into the peace deal between the Philippine government and MILF.

The most recent in a long list of abductions blamed on the Abu Sayyaf prior to the incident in Sabah on Wednesday was the reported kidnapping of an elementary school principal in Basilan on Monday.

- The Star/Asia News Network

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Search for missing MH370 jet could turn on robot subs

This 2011 photo provided by Sylvain Pascaud shows the ship Alucia and the REMUS 6000 robot sub during the search for Air France Flight 447. Unmanned subs, also called autonomous underwater vehicles or AUVs, played a critical role in locating the wreckage of the lost Air France jet, two years after it crashed in the middle of the south Atlantic. The find allowed searchers to recover the black boxes that revealed the malfunctions behind the tragedy. Sylvain Pascaud, Associated Press

Two miles down or more and darker than night, the ocean becomes a particularly challenging place for human searchers.

If the wreckage of a missing Malaysian airliner rests somewhere in the Indian Ocean's depths, then investigators will likely need to entrust the hunt at least partly to robot submarines and the scientists who deploy them to scan remote swaths of the seafloor.

Such unmanned subs, called autonomous underwater vehicles or AUVs, played a critical role in locating the carcass of a lost Air France jet in 2011, two years after it crashed in the middle of the south Atlantic. The find allowed searchers to recover the black boxes that revealed the malfunctions behind the tragedy.

That search keyed off critical information: The search area for the Air France jet was much smaller than that for Malaysia Airlines Flight 370, and the first pieces of wreckage were recovered within days of the crash.

Even then, it required two years and four deep water search missions before a team from the Woods Hole Oceanographic Institution, using an AUV equipped with side-scan sonar, located the jet about 12,800 feet (3,900 meters) underwater.

"Air France 447 is a bit different from Malaysian Air 370 in that we had a few more clues to work with," said Dave Gallo, who led the search team from Woods Hole, located on Massachusetts' Cape Cod. The independent research institution has offered its services to investigators but has not been asked to join the current search effort.

Before unmanned subs can be sent down to look for the Malaysian jet, the search zone must be narrowed considerably. That depends on finding wreckage on the surface. Officials cautioned Wednesday that search planes, which have scoured the ocean for more than three weeks without finding any sign of the downed jet, aren't certain to find any wreckage and that investigators may not be able to determine the reason for its disappearance.

The size of the search area changes daily because of factors such as currents; on Wednesday it was 85,000 square miles (221,000 square kilometers).

But if investigators can zero in on an approximate crash location, they will likely turn to AUVs to begin the methodical task of tracking back and forth across miles of ocean floor in search of anomalies that might be wreckage.

"I like to think of it as mowing the lawn. You want to cover every bit of it," Gallo said.

"You need a little bit of luck and a lot of prayer that the oceans are going to cooperate, and then off you go."

The unmanned subs used by the Woods Hole team were developed as tools to research and monitor relatively shallow coastal waters, measuring variables like salinity and temperature over wide areas for hours on end. But AUVs are increasingly harnessed to perform some of the most demanding underwater jobs.

The U.S. Navy uses them to search for underwater mines because they can stay below the surface of even very cold water much longer than any diver, without the worry of exposing a human to danger. Energy companies employ unmanned subs to survey the floor at underwater drill sites.

In 2009, California's Waitt Institute sent down a pair of AUVs that surveyed more than 2,000 square miles of South Pacific ocean bottom over 72 days in an unsuccessful search for Amelia Earhart's plane.

The area off western Australia where search planes and aircraft are looking for the Malaysian jet slopes from about 2,600 feet (800 meters) to about 9,800 feet (3,000 meters) deep. But part of the zone drops into the narrow Diamantina trench, about 19,000 feet (5,800 meters) down.

"Let's hope the wreck debris has not landed over this escarpment. It's a long way to the bottom," said Robin Beaman, a marine geologist at Australia's James Cook University.

The U.S. Navy last week sent a Bluefin-21 autonomous sub to Australia to prepare for an eventual deep water search. That sub can dive to about 14,800 feet (4,500 meters). The largest unmanned subs used by Woods Hole researchers are built to reach depths of about 19,700 feet (6,000 meters).

Searchers can also use tethered submersibles, towed by ships from cable that allows for real-time data transmission to the surface and a continuous supply of power to the vehicle. But it is a very slow process. AUVs can scan a larger area more quickly, without being affected by conditions on the surface. But they must be brought back to the surface to recharge, and for researchers to download and analyze their data.

Even so, they are much better suited to the job of deep water search than any manned sub, whose descents are limited by air, light and power, as well as safety concerns, said William Sager, a professor of marine geophysics at the University of Houston.

Sager recalled that in 2000, when he climbed aboard a sub and ventured 5,600 feet (1,700 meters) down to the bottom of the Gulf of Mexico, all those factors limited time on the sea floor to just four hours, moving at a crawl. A researcher looking out a porthole into even the clearest water with a very bright light can't see beyond 100 feet, he said.

Unmanned subs are far more flexible. When Woods Hole engineers built their first REMUS 6000 sub a little more than a decade ago, they tested it off the Bahamas by driving it down a trench the scale of the Grand Canyon, said Chris von Alt, who led the team that developed the craft and then co-founded Hydroid Inc., the Massachusetts manufacturer of the subs.

The REMUS sub — nearly 13 feet long, 1,900 pounds and mustard yellow — is equipped with sonar that can be programmed to capture images of vast stretches of seafloor and the objects resting there. Powered by a lithium battery, the unmanned subs stay below the surface for 20 to 24 hours. Scientists on the surface are now able to modify instructions to the sub via an acoustic link that allows them to look at bits of data gathered by the vehicle, von Alt said.

But they don't know what the sub has found until it surfaces and its data is fully downloaded to a computer.
The task requires patience and, for researchers whose livelihoods are focused on ocean life, a willingness to harness their expertise in a grim but necessary pursuit of answers.

"That's why you do it," von Alt said. "One of (the reasons) is, 'Why did it happen?' But the other is to get closure for the families who have suffered through the tragedy."

- Contributed by AP writers Adam Geller and Nick Perry in Wellington, New Zealand and videographer Steve Andrada in Woods Hole, Mass.

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Disturbing legal implications on sedition and 'fatwa' in Malaysia

Kassim Ahmad & Karpal Singh Two recent cases raise the issue of what amounts to sedition and why one can’t question or challenge a ‘fatwa’.

THE recent conviction of Karpal Singh under the Sedition Act and the charging of Kassim Ahmad under the Federal Territories Syariah offences law raise some disturbing questions with serious implications as to where we are headed as a democratic nation.

First, let us look at the Sedition Act. The trouble with this law, a remnant of British colonialism, is two-fold. First, its basic premise is that criticism of authority should be controlled. This in itself is already an affront to democracy.

Second is its open-ended nature. Just what exactly amounts to sedition, for example. However, up until the Karpal Singh case, I thought there was one defence in the Sedition Act that was pretty strong.

Something is not seditious if you are pointing out that the object of your criticism has done something wrong, especially in the context of their constitutional limitations. This appears so clear to me that it seemed unlikely any court could find a way around it.

Alas, that is exactly what seems to have happened to Karpal. He basically said that the decision made by the Sultan of Perak of choosing a new Mentri Besar for the state in 2009 could be questioned in court.

I can’t for the life of me see what is seditious about that. Is the Sultan limited by the Constitution and the law in the discharge of his powers? Yes, of course he is. And if there is a dispute as to whether he acted lawfully or not, could he not be questioned? Again, of course he should, for we live in a constitutional and not an absolute monarchy.

And lastly, if there is to be a questioning of the acts of a member of the royalty, is there a lawful manner with which this can be done? Again the answer is yes, because we have the Special Court which was designed specifically for the royals and inserted into our Constitution by the Government.

Even within the authoritarian nature of the Sedition Act, there seem to be limits as to what can be deemed seditious. I thought those limits were clear enough. It appears that I am wrong.

What is of concern is that even when an act clearly falls within the allowable limits of a law, this does not appear to make any difference at all. Thus, the reach of a poor law becomes even greater and all that much more oppressive.

The second thing I want to talk about is the charging of Kassim Ahmad. This case raises some serious problems with some of the Syariah laws we have in this country.

According to the Syariah Offences law of the Federal Territories, it is an offence to question and speak in contradiction to a fatwa made by the mufti.

This fatwa need not be gazetted, that is to say made into law, just its mere exclamation is enough to give it weight of law. Needless to say, fatwas which have been gazetted can’t be questioned either.

Firstly, one wonders why one can’t question or challenge a law? If a fatwa is gazetted and made into law, what makes it different from any other law? Why can’t it be challenged? I can criticise the Contracts Act so why can’t I criticise any other thing which affects my life?

But what is really disturbing is the fact that a fatwa, which is after all merely an opinion, can carry the weight of law even without going through the legislative process of debate and voting. This in effect means that one person’s words suddenly become akin to a law for we cannot challenge it and if we do we can face a fine and jail.

This is frightfully undemocratic and can lead to some horrific scenarios. What if a mufti passes a fatwa saying that any sort of dissension against the civil government is wrong?

According to the Federal Territories law, any challenge of fatwa can be punished. What kind of democracy are we living in if a person’s statement by itself can have such authority?

Much has been said about how Malaysia is edging towards a more liberal and open democracy. Laws have been repealed or changed and steps (albeit baby steps) have apparently been taken.

What these two events show is that there are still some very undemocratic laws in existence, they are still being used and any hope that we are becoming more democratic is hopelessly naïve.

Brave New World by Azmi Sharam

> Azmi Sharom (azmisharom@yahoo.co.uk) is a law teacher. The views expressed are entirely the writer’s own.

Searching the vast seabed of jet hunt zone mostly flat with one trench for MH370

This undated graphic provided by Commonwealth of Australia (Geoscience Australia) Dr. Robin Beaman

WELLINGTON, New Zealand — Two miles beneath the sea surface where satellites and planes are looking for debris from the missing Malaysian jet, the ocean floor is cold, dark, covered in a squishy muck of dead plankton and — in a potential break for the search — mostly flat. The troubling exception is a steep, rocky drop ending in a deep trench.

The seafloor in this swath of the Indian Ocean is dominated by a substantial underwater plateau known as Broken Ridge, where the geography would probably not hinder efforts to find the main body of the jet that disappeared with 239 people on board three weeks ago, according to seabed experts who have studied the area.

Australian officials on Friday moved the search to an area 1,100 kilometers (680 miles) to the northeast of a previous zone as the mystery of Malaysia Airlines Flight 370 continued to confound. There is no guarantee that the jet crashed into the new search area. Planes that have searched it for two days have spotted objects of various colors and sizes, but none of the items scooped by ships has been confirmed to be related to the plane.

The zone is huge: about 319,000 square kilometers (123,000 square miles), roughly the size of Poland or New Mexico. But it is closer to land than the previous search zone, its weather is much more hospitable — and Broken Ridge sounds a lot craggier than it really is.

And the deepest part is believed to be 19,000 feet within the range of American black box ping locators on an Australian ship leaving Sunday for the area and expected to arrive in three or four days.

Formed about 100 million years ago by volcanic activity, the ridge was once above water.

Pulled under by the spreading of the ocean floor, now it is more like a large underwater plain, gently sloping from as shallow as about 2,625 feet to about 9,843 feet deep. It got its name because long ago the movement of the Earth’s tectonic plates separated it from another plateau, which now sits about 1,550 miles to the southwest.

Much of Broken Ridge is covered in a sediment called foraminiferal ooze, made of plankton that died, settled and was compacted by the tremendous pressure from the water above.

“Think like it’s been snowing there for tens of millions of years,” said William Sager, a professor of marine geophysics at the University of Houston in Texas.

Like snow, the layer of microscopic plankton shells tends to smooth out any rises or falls in the underlying rock. In places, the layer is up to half a mile deep.

But if the fuselage of the Boeing 777 did fall on to Broken Ridge, it would not sink much into the muck.

“The surface would be soft, it would squeeze between your toes, but it’s not so soft that you would disappear like snow,” Sager said. “Something big like pieces of an airplane, it’s going to be sitting on the surface.”

Searchers will be hoping that if the latest area turns out to be where the plane crashed — and that remains educated guesswork until searchers can put their hands on aerial debris sightings and check what it is — the fuselage did not go down on the southern edge of Broken Ridge.

That’s where the ocean floor drops precipitously — more than 2 1/2 miles in places, according to Robin Beaman, a marine geologist at Australia’s James Cook University. It’s not a sheer cliff, more like a very steep hill that a car would struggle to drive up. At the bottom of this escarpment is the narrow Diamantina trench, which measurements put as deep at 19,000 feet, though no one is sure of its greatest depth because it has never been precisely mapped.

“Let’s hope the wreck debris has not landed over this escarpment — it’s a long way to the bottom,” Beaman said.

The Diamantina trench, named after an Australian navy vessel, is one of the deeper sections of the parts of the oceans that surround Antarctica, according to Mike Coffin, the executive director of the Institute for Marine and Antarctic Studies at Australia’s University of Tasmania.

The trench’s rocky crags and crannies would make it difficult for ships using instruments like side-scanning sonar or multi-beam echo sounders to distinguish any debris from the crevices.

Searchers will especially be hoping to locate the jet’s two “black boxes,” which recorded sounds in the cockpit and data on the plane’s performance and flight path that could help reconstruct why it diverted sharply west from its overnight flight from Kuala Lumpur, Malaysia, to Beijing on March 8. The black boxes were designed to emit locator pings for at least 30 days, and are projected to lose battery power — and thus their pings — by mid-April.

The pinger can be heard as far as 2 1/2 miles away, but the distance can vary widely, depending on the state of the sea and the wreckage location, said Joseph Kolly, director of research and engineering for the U.S. National Transportation Safety Board. Black boxes can get buried or muffled by other wreckage, and thermoclines, which are layers of water with great variations in temperature, can refract the signal, he said.

The sediment on Broken Ridge is unlikely to inhibit the ping — but on the escarpment or in the trench, rocks could scatter the sound, making it harder to detect, according to Mike Haberman, a research scientist specializing in acoustics at the University of Texas, Austin.

To pinpoint the ping they hear from the surface, searchers likely will run a submersible equipped with sonar several hundred feet above the ocean floor. The unmanned underwater vehicle will putter along at a slow jog, able to “see” objects on the floor that may seem out of place. But its vision is limited — in a day it could cover an area only about the size of Manhattan, Sager said.

The observations stored in the vehicle’s memory can be accessed only by bringing it to the surface.

Under the best conditions, to survey the entire new search area could take between three months and up to nearly two years, depending on the quality of data needed to identify the debris, according to calculations by David T. Sandwell, a professor of geophysics who specializes in seafloor mapping at the Scripps Institution of Oceanography in San Diego.

Because it is such a painstaking — and expensive — process, most mapping has been focused on things that people consider useful, like underwater shipping hazards and potential oil deposits. With nothing much to interest people in the this part of the Indian Ocean, the maps tend to follow features like the volcanically active mid-ocean ridges, leaving big blank spaces in between.

There are 50-mile-wide strips of the search area where no shipboard measurements have been taken and scientists use less detailed satellite measurements and educated guesswork to depict what the floor actually looks like.

Precisely what the seafloor looks like in detail in the area of the new search is another in a long line of Flight 370 mysteries.

By JUSTIN PRITCHARD AND NICK PERRY  The Associated Press

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