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Old Mar 17, 2014, 3:08 pm
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In order to a) keep the original thread focused on confirmed news and known facts, and b) allow folks a place to discuss their ideas about what might have happened, the MH370 moderators and Community Director have decided to open this thread.

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Old May 7, 2014, 10:48 am
  #1711  
 
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Don't think they know what they are doing. The Chinese picked up signals a great distance away as well.
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Old May 7, 2014, 12:26 pm
  #1712  
 
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I think sound underwater can travel differently due to currents and storms
http://www.cnn.com/2014/04/11/tech/i...erwater-sound/

Interesting poll here
http://www.huffingtonpost.co.uk/2014...n_5278231.html
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Old May 9, 2014, 6:08 am
  #1713  
 
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Originally Posted by john398
I think sound underwater can travel differently due to currents and storms
http://www.cnn.com/2014/04/11/tech/i...erwater-sound/

Interesting poll here
http://www.huffingtonpost.co.uk/2014...n_5278231.html
Drawing any conclusion from polls with outlandish choices is dangerous... fwiw, if someone asked me to choose an option from a poll like that, I'd probably pick aliens, too, simply for wasting my time/insulting my intelligence.
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Old May 10, 2014, 5:18 pm
  #1714  
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A very interesting read here from The Atlantic.

It's the best explanation I've seen of how the Immarsat data was crunched, how the conclusions were drawn, and what parts of the data remain problematic.

http://www.theatlantic.com/technolog...old-up/361826/
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Old May 11, 2014, 4:57 am
  #1715  
 
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Originally Posted by swag
A very interesting read here from The Atlantic.

It's the best explanation I've seen of how the Immarsat data was crunched, how the conclusions were drawn, and what parts of the data remain problematic.

http://www.theatlantic.com/technolog...old-up/361826/
They don't seem to be too certain of Immarsat's results/conclusion.
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Old May 11, 2014, 3:24 pm
  #1716  
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Originally Posted by DanielW
They don't seem to be too certain of Immarsat's results/conclusion.
AFAIK, Inmarsat has not released all of its data, nor have they fully disclosed their methodology, so I am not surprised that others weren't able to recreate what Inmarsat did.
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Old May 11, 2014, 8:39 pm
  #1717  
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Originally Posted by RatherBeOnATrain
AFAIK, Inmarsat has not released all of its data, nor have they fully disclosed their methodology, so I am not surprised that others weren't able to recreate what Inmarsat did.
Data is more or less by definition empirical and hence subject to error. I still don't have much of an idea of how much error is possible, how likely various errors are or if they know themselves.
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Old May 12, 2014, 12:05 am
  #1718  
 
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Not strictly related to the search, but Inmarsat are apparently proposing a free basic service to help with aircraft tracking in the future: http://bbc.co.uk/news/science-environment-27369288

Last edited by EsherFlyer; May 12, 2014 at 12:18 am
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Old May 12, 2014, 5:36 am
  #1719  
 
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Originally Posted by mikerees1967
I'm sorry if this has already been covered on this forum. I am rather confused by the fact that a couple of weeks ago it was thought that the signals from the black box were being picked up and it was stated that theses signals could not have been from anything else. I also understand that the signal from the BB could only travel about 3km. Now we are told that "it is back to square one". If the signals were being picked up surely the plane is within 3km of where the ship was that picked up the signal and it should be "nearby". Have I missed the news item saying these were not the signals from the BB?
The latest is that they're discounting the most recent two pings, which were at 27kHz (hadn't heard that before) and were only picked up for a short duration. They still seem to believe in the original 2 hour event which had the frequency at 33kHZ (and the correct 1 sec cadence). This changes the focus of the search area somewhat and that's where the Ocean Shield is headed now.

Originally Posted by RatherBeOnATrain
AFAIK, Inmarsat has not released all of its data, nor have they fully disclosed their methodology, so I am not surprised that others weren't able to recreate what Inmarsat did.
Even if the Inmarsat data were 100% error-free, the conclusions require assumptions about speed and whether the speed and heading were constant or changing. Thus there is necessarily considerable uncertainty involved.

Last edited by cblaisd; May 12, 2014 at 7:42 am Reason: merged poster's two consecutive posts
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Old May 12, 2014, 9:09 am
  #1720  
 
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Originally Posted by EsherFlyer
Not strictly related to the search, but Inmarsat are apparently proposing a free basic service to help with aircraft tracking in the future: http://bbc.co.uk/news/science-environment-27369288
That's generous of Inmarsat and a step in the right direction.
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Old May 13, 2014, 9:59 am
  #1721  
 
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Originally Posted by trailboss99
That's generous of Inmarsat and a step in the right direction.
Indeed but it wouldn't have helped in this case because someone switched it off anyhow.
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Old May 13, 2014, 5:27 pm
  #1722  
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Woods Hole Oceanographic Inst: Robotic Deep-sea Vehicle Lost on Dive to 6-Mile Depth

While not part of the MH-370 search, this press release illustrates the difficulty of searching ocean floors:

Woods Hole Oceanographic Institute
News Release: Robotic Deep-sea Vehicle Lost on Dive to 6-Mile Depth - Scientists think Nereus imploded exploring the Kermadec Trench
May 10, 2014


On Saturday, May 10, 2014, at 2 p.m. local time (10 p.m. Friday EDT), the hybrid remotely operated vehicle Nereus was confirmed lost at 9,990 meters (6.2 miles) depth in the Kermadec Trench northeast of New Zealand. The unmanned vehicle was working as part of a mission to explore the ocean's hadal region from 6,000 to nearly 11,000 meters deep. Scientists say a portion of it likely imploded under pressure as great as 16,000 pounds per square inch.
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Old May 13, 2014, 5:59 pm
  #1723  
 
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Ocean Shield back in action again

Resupplied Ocean Shield now back in the search area... let's not give up yet!
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Old May 14, 2014, 8:29 am
  #1724  
 
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Originally Posted by RatherBeOnATrain
You think they would know how much pressure it can safely operate in and only go that deep
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Old May 14, 2014, 12:07 pm
  #1725  
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Originally Posted by john398
You think they would know how much pressure it can safely operate in and only go that deep
I'm sure they did. But I'm also sure that at 16,000 PSI there isn't a lot of room for error; faulty parts, imperfect connections or whatever.
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