Talk:Blue hole

Geology Low‑importance

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Underwater diving Low‑importance

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Wiki Education Foundation-supported course assignment

This article was the subject of a Wiki Education Foundation-supported course assignment, between 23 September 2019 and 14 December 2019. Further details are available on the course page. Student editor(s): Ldd52. Peer reviewers: Chelcgrav.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 16:00, 16 January 2022 (UTC)[reply]

Feet or Meters?

Feet and meters are both used in this article. I think it is Wikipedia policy to use metric measurements wherever possible... I could be wrong, though... Anybody know what the policy is? Paradoxsociety (talk) 04:39, 29 February 2008 (UTC)[reply]

Merge discussion

I see no reason to merge Blue hole and Great Blue Hole as is currently proposed. "Blue hole" is an overview article on the geographic phenomenon and "Great Blue Hole" is a fully formed and referenced stand-alone article on a specific blue hole (as is Dean's Blue Hole and Blue Hole (Red Sea)). It would be akin to merging every significant mountain into a single Mountain article. (cross posted to Talk: Great Blue Hole Jezebel'sPonyo ^shhh 17:09, 28 January 2010 (UTC)[reply]

Oppose merge. As above. Both articles are valid as is, there seems no benefit from a merge. Andy Dingley (talk) 19:33, 28 January 2010 (UTC)[reply]

As the individual who tagged the articles has not put forth any reason why the merge would be necessary or helpful, and since the only talk page discussion has been in favour of keeping the status quo, I've removed the suggested merge tags. --Jezebel'sPonyo ^shhh 14:45, 6 February 2010 (UTC)[reply]

Deepest blue hole?

On this page it says the deepest blue hole is one thing, on the other page it says it is the other? which is which?

Blue color also from limestone?

The article says "The deep blue color is caused by the high transparency of water and bright white carbonate sand."

Isn't it also due to the in the water? I'd guess that there is a lot of limestone in the water around coral reefs, and that seems to give a vivid blue hint to the water. I'm currently visiting Ko Lanta, and even in a shallow pool in the sand on the beach, 30 cm deep or less, the blue color is visible, in the late afternoon with a mostly grey sky. Seems to be the minerals in the water, and File:Havasu Falls 2 md.jpg suggests that limestone has this effect. This would surely influence the color of deeper water as well. --Chriswaterguy talk 09:10, 1 November 2011 (UTC)[reply]

How formed?

I assumed that these holes were formed in the same way that sinkholes are formed on dry land, i.e. there is an existing cave system whose roof collapsed. Apparently that is not the case. Afaik, solution caves do not form in limestone in marine (salt water) environments; rather, they form in fresh water environments when down-percolating water carries dissolved CO2 (carbonic acid) and dissolves away limestone. But the lowest sea level during the Pleistocene was around 120 meters below the current; if some of these blue holes are over 300 meters deep, then barring quite substantial land sinkage, at least much of the depth of these blue holes these must have formed below sea level. Are there hypotheses about how they formed at such depths? That seems like it would be a good addition to this article, specifically to the existing "Formation" section. Mcswell (talk) 21:58, 30 April 2024 (UTC)[reply]

External links modified

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External links modified

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A Commons file used on this page or its Wikidata item has been nominated for speedy deletion

The following Wikimedia Commons file used on this page or its Wikidata item has been nominated for speedy deletion:

Chemical and Physical Characteristics of Blue holes.png

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New deepest blue hole?

Article: https://www.livescience.com/planet-earth/geology/deepest-blue-hole-in-the-world-discovered-with-hidden-caves-and-tunnels-believed-to-be-inside

Lede: "Scientists have yet to reach the bottom of the Taam Ja' Blue Hole in Mexico's Chetumal Bay, which new measurements hint could be connected to a labyrinth of submarine caves and tunnels."
Quote: "New measurements indicate the Taam Ja' Blue Hole (TJBH), which sits in Chetumal Bay off the southeast coast of the Yucatan Peninsula, extends at least 1,380 feet (420 meters) below sea level. That's 480 feet (146 m) deeper than scientists initially documented when they first discovered the blue hole in 2021, and 390 feet (119 m) deeper than the previous record holder — the 990-foot-deep (301 m) Sansha Yongle Blue Hole, also known as the Dragon Hole, in the South China Sea."

Rusty Lugnuts (talk) 07:02, 30 April 2024 (UTC)[reply]

Diving risks?

Although there are some additionnal dive risks in some blue holes (see blue hole in dahab), there isn't inherently more of a risk to get nitrogen narcosis in a blue hole opposed to a normal, open water dive. The "diving risks" section of this article makes it seem as there is, which isn't the case. Same thing with sharks "attacking humans", usually sharks would leave humans alone. I would be inclined to believed they could be territorial about their territory if there was evidence or a source provided but there is none. One of the real risk(s) of blue holes would be possible presence of haloclines which would change the diver's buoyancy unexpectedly. Luceshh (talk) 14:56, 27 September 2024 (UTC)[reply]