Talk:Challenger Deep

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A news item involving Challenger Deep was featured on Wikipedia's Main Page in the In the news section on 3 June 2009.

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A fact from this article was featured on Wikipedia's Main Page in the On this day section on January 23, 2012.

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How was 1875 sounding made?

It says the first sounding of the Challenger Deep was made in 1875. How? Did they carry over 5 miles (8km) of rope? If it was really a weight on the end of a 5 mile rope, how did they know when the end reached the bottom? RedTomato (talk) 19:17, 15 February 2009 (UTC)[reply]

Purely speculation, but if you can get to a point where you realize that you're making slack in the rope, and then remove the slack until the line is taut again, the length of rope below the water should be the distance to the bottom. MMetro (talk) 04:27, 17 February 2009 (UTC)[reply]

Back then they used a 'lead line network' to survey in shallower areas—-several lead lines tethered together and dragged across the seafloor by several ships tethered together

'wire rope' is another name for modern 'braided sea cable' which of course is very heavy but does fit on a manageable sized 10K meter spool on an oceanographic winch, and as such when the cable is spooled over the side of a ship the weight of the cable itself, plus whatever it might be weighted with, (ie usually lead cast weights calculated before hand to be appropriate to overcome buoyancy and currents issues) puts a noticeable list on the ship, and the ship handler is expected to know how to drive the ship correctly to help compensate for currents too, and the concept of the 'wire angle' is noted. So a straight up and down wire angle is preferable, then when the weight hits the alleged bottom a resultant tell-tale vibration is likely transferred back up the cable to the ship. 76.21.27.240 (talk) 05:03, 30 March 2023 (UTC)[reply]

Para 4.1.5 Planned crewed descents -- recm deletion of this entire sub-para

This para was inserted to identify those organizations competing to dive into the Challenger Deep, when such an ability displayed pioneering technology and the expenditure of major investments in designing and fabrication of a unique vehicle to make the dive. Many announced such an intention, but their efforts have now been made moot by the activities of the deep submersible Limiting Factor over the last two years. Recommend this entire section be deleted as no longer informative or useful. Gwyncann (talk) 18:06, 14 September 2020 (UTC)[reply]

2drms

Is it possible to define (2drms)? thanks 151.29.76.84 (talk) 05:53, 5 December 2021 (UTC)[reply]

see Circular error probable

Another question: I feel that

Such a claim will require a survey of all three basins by both echosounders and pressure gauges, such that all depths are measured by one set of equipment and use the same correction calculations.

is somehow contradictory with the above statement that the DSV Limiting Factor has measured all the three deeps. Probably the DSV LF have not claimed this even if they could, but a less doubt-evoking text is welcomed (I know: I see trouble were no other finds them). thanks again 151.29.76.84 (talk) 09:46, 5 December 2021 (UTC)[reply]

The measurements were not made during one dive. Even the best CTD's measurements have to deal with (minor) instrument drift.--Francis Flinch (talk) 14:55, 5 December 2021 (UTC)[reply]

thanks 151.29.76.84 (talk) 21:05, 5 December 2021 (UTC)[reply]

What is a sample?

No link to what they are or how they’re made. 2600:1700:6756:4830:9DFB:D817:1B88:C1CD (talk) 23:39, 10 February 2022 (UTC)[reply]

The samples taken were depth soundings. All the information was there in the paragraph about the 1875 Challenger expedition, but it was presented in a slightly confusing order. I have tweaked this to make things a bit more clear. Does that help? Pyrop e 02:50, 11 February 2022 (UTC)[reply]

Explaining bomb/explosive soundings

There are a lot of mentions here of bomb soundings or explosive soundings, which are not explained in the article. I would like to link these to another appropriate article, but I don't know what the right target would be. The articles on echo sounding, depth sounding, and multibeam echosounder don't seem to cover this. One thing I found was Sofar bomb but it doesn't seem like the right topic. Can anyone help to find the right article, or do we have a gap here? Orange Suede Sofa (talk) 03:27, 24 June 2023 (UTC)[reply]

How deep?

I've started a discussion at Talk:Mariana Trench about the inconsistency between the values used in the two articles. Mikenorton (talk) 12:12, 7 May 2024 (UTC)[reply]