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posted by hubie on Sunday October 02 2022, @09:49AM   Printer-friendly
from the time-for-a-prequel dept.

Arthur T Knackerbracket has processed the following story:

In 1918, the steam-powered SS Mesaba sank in the Irish Sea after being hit by a torpedo from a German submarine during World War I. The ship might have been forgotten, except that it had ties to the infamous Titanic disaster of 1912. On Tuesday, Bangor University announced that the shipwreck of the Mesaba has been located.

Mesaba was a merchant vessel traveling in the same waters as the Titanic. According to the Encyclopedia Titanica, a repository of Titanic research, the Mesaba sent the large passenger ship a radio message cautioning of heavy pack ice and a great number of large icebergs. The message, however, was never relayed to the Titanic's bridge. The Titanic struck an iceberg and sank later that evening, in a disaster that claimed more than 1,500 lives.

The research team found the Mesaba among 273 shipwrecks scattered across 7,500 square miles (19,400 square kilometers) of the sea. The researchers used an advanced seafloor mapping technology called multibeam sonar and combined the results with historical records and maritime archives to identify the merchant ship's final resting place. A dramatic sonar image shows the Mesaba split into two main parts.  


Original Submission

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First Full-sized 3D Scan of the Wreck of the Titanic 5 comments

Deep sea researchers have used two submersibles to make the first full, 3-dimensional scan of the wreck of the sunken passenger ship, The Titanic, including much of the 3-mile long debris field. This is a major step forward in evidence-based analysis of the wreck from over a hundred years ago.

The new scan was "devoid of that," he said, adding, "It is completely based on data and not human interpretation and that is why we are now seeing it in its larger context for the first time ever."

Atlantic Productions said "one major area of deterioration" had already been observed in the officers' quarters. "This included the room of Captain Edward John Smith and discovered that the iconic captain's bathtub has now disappeared from view," it added.

"Now we're getting objective, so we can get really serious with the science of understanding the wreck," Stephenson said.

He added that he was "absolutely convinced," that the photogrammetry model would now be used "not just for Titanic, but for all underwater exploration," because it "ushers in a new phase of exploration and analysis."

Much of the wreck lies in two main pieces, far apart from each other, at a depth of about 4,000 meters. Around 700k images where taken and stitched together to created the model.

Previously:
(2022) Researchers Discover Wreck of Ship that Tried to Warn the Titanic
(2022) OceanGate Ramps Up the Research for its Second Deep-sea Expedition to the Titanic
(2020) An Aurora that Lit Up the Sky Over the Titanic Might Explain Why It Sank
(2020) US Court Grants Permission to Recover Marconi Telegraph from Titanic's Wreckage [Updated]
(2018) Finding the Titanic with ROVs and Navy Funding


Original Submission

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  • (Score: 4, Insightful) by janrinok on Sunday October 02 2022, @06:17PM (5 children)

    by janrinok (52) Subscriber Badge on Sunday October 02 2022, @06:17PM (#1274603) Journal

    During the 1970s and 80s I viewed quite a few sonar 'images' of underwater objects. None of them really showed any significant detail other than the existence or absence of something.

    Looking at the images in this story shows how much technology has advanced in that 50 years, but even these images are coarse compared with some that I saw about a decade ago, also from a research vessel. Digital signal processing made much of this possible and improved hydrophonics too, of course. The modern sonobuoys have incredible beam-shaping properties and the multi-beam sonar that was used in these discoveries was, until not very long ago, little more than a dream.

    --
    I am not interested in knowing who people are or where they live. My interest starts and stops at our servers.
    • (Score: 2) by RS3 on Sunday October 02 2022, @08:09PM (4 children)

      by RS3 (6367) on Sunday October 02 2022, @08:09PM (#1274616)

      Yes, we've come a long way. A friend of mine works R&D at an acoustic transducer company. He probably divulges more details than he should, but it's amazing what they're doing in just the transducers, including various sound wave shaping, lensing, filtering, etc., all done with various materials and their sonic characteristics such as propagation speeds. Also the carrier frequencies have increased several magnitudes. 40KHz used to be typical, but now they're doing 50MHz and above. I had to think about 50MHz as being "sound".

      So incredible transducer advancements, then put into phased arrays [hackaday.com] and as you mentioned huge advancements in digital signal processing- both hardware and software / algorithms.

      • (Score: 2) by Username on Monday October 03 2022, @09:48AM (3 children)

        by Username (4557) on Monday October 03 2022, @09:48AM (#1274705)

        huge advancements in digital signal processing- both hardware and software / algorithms.

        Yeah, the image looks too good to me, like they scanned, then sent the results through some 3d modeling software. When I look at sonar images, it's just a bunch of colored lines that make no sense. This sonar image makes sense, so I have to think that it isn't a real sonar image.

        • (Score: 2) by RS3 on Monday October 03 2022, @04:43PM (2 children)

          by RS3 (6367) on Monday October 03 2022, @04:43PM (#1274741)

          By "colored lines", do they look like these: https://en.wikipedia.org/wiki/Spectrogram [wikipedia.org]

          or in 3D, like these: https://en.wikipedia.org/wiki/Waterfall_plot [wikipedia.org]

          The 2D plots use color to show the 3rd axis variable's amplitude.

          My problem, and possibly for many people, is there's no absolute standard that correlates color to amplitude.

          A great example is weather radar- different people render using different color schemes. Many times I prefer shades of gray rather than confusing color scales.

          The real 3D images are real. Signal processing systems have been able to create true 3D images from sonar, radar, and other scanning technologies. What I find strange is the medical world often still uses the older sonogram displays for ultrasound diagnostic scans. But often, especially when looking at fetuses they use the true 3D imaging systems.

          • (Score: 3, Funny) by Username on Monday October 03 2022, @08:02PM (1 child)

            by Username (4557) on Monday October 03 2022, @08:02PM (#1274753)

            Yeah, I'd call those sonar images. I have no idea what I'm looking at.

            This is the point where Cypher will tell Neo, "There is too much information in the matrix to decode. You get used to it. I don't even see the code, all I see is blond, brunette, redhead"

            • (Score: 2) by RS3 on Monday October 03 2022, @08:26PM

              by RS3 (6367) on Monday October 03 2022, @08:26PM (#1274756)

              So you're saying we need to use "blond, brunette, redhead" for false color rendering [wikipedia.org]. Well alright alright alright.

  • (Score: 3, Interesting) by bzipitidoo on Sunday October 02 2022, @06:42PM (1 child)

    by bzipitidoo (4388) on Sunday October 02 2022, @06:42PM (#1274604) Journal

    Got curious what percentage of ships end up sunk vs scrapped, and after a bit more searching than I expected -- was that question that hard? -- came up with very roughly 10%. What percentages are accidents, deliberate, or acts of war, I didn't check further. Lot of peacetime accidents are down to the operators cutting costs to the bone, so that ships aren't maintained and crews aren't trained.

    • (Score: 2) by RS3 on Sunday October 02 2022, @08:17PM

      by RS3 (6367) on Sunday October 02 2022, @08:17PM (#1274617)

      ...cutting costs to the bone, so that ships aren't maintained and crews aren't trained.

      Cynical me thinks the bean counters (accountants) find it financially advantageous to let things deteriorate, depreciate, then write-off the expense. Besides, people usually prefer "New!" over refurbished or old yet well maintained and still functional.

      There's a fairly recent trend in automobile restoration: "resto-mod" where you restore a car, but update (sometimes majorly) things. Point is, things don't have to be scrapped / sent to landfill (or bottom of ocean).

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