Under the Dome

[Image: Courtesy U.S. Department of the Interior Bureau of Ocean Energy Management (BOEM)].

A gigapixel bathymetric map of the Gulf of Mexico’s seabed has been released, and it’s incredible. The newly achieved level of detail is almost hard to believe.

[Images: Courtesy U.S. Department of the Interior Bureau of Ocean Energy Management (BOEM)].

The geology of the region is “driven not by plate tectonics but by the movement of subsurface bodies of salt,” Eos reported last week. “Salt deposits, a remnant of an ocean that existed some 200 million years ago, behave in a certain way when overlain by heavy sediments. They compact, deform, squeeze into cracks, and balloon into overlying material.”

This means that the bottom of the Gulf of Mexico “is a terrain continually in flux.”

How the salt got there is the subject of a long but fascinating description at Eos.

It is hypothesized that the salt precipitated out of hypersaline seawater when Africa and South America pulled away from North America during the Triassic and Jurassic, some 200 million years ago. The [Gulf of Mexico] was initially an enclosed, restricted basin into which seawater infiltrated and then evaporated in an arid climate, causing the hypersalinity (similar to what happened in the Great Salt Lake in Utah and the Dead Sea between Israel and Jordan).

Salt filled the basin to depths of thousands of meters until it was opened to the ancestral Atlantic Ocean and consequently regained open marine circulation and normal salinities. As geologic time progressed, river deltas and marine microfossils deposited thousands more meters of sediments into the basin, atop the thick layer of salt.

The salt, subjected to the immense pressure and heat of being buried kilometers deep, deformed like putty over time, oozing upward toward the seafloor. The moving salt fractured and faulted the overlying brittle sediments, in turn creating natural pathways for deep oil and gas to seep upward through the cracks and form reservoirs within shallower geologic layers.

These otherwise invisible landscape features “oozing upward” from beneath the seabed are known as salt domes, and they are not only found at the bottom of the Gulf of Mexico.

[Image: Avery Island, Louisiana, archived by the U.S. Library of Congress].

The black and white photos you see here are from a salt mine on Avery Island, Louisiana, archived by the U.S. Library of Congress. The photos date back as far as 1900, and they’re gorgeous.

[Image: Avery Island, Louisiana, archived by the U.S. Library of Congress].

This is what it looks like inside those salt domes, you might way, once industrially equipped human beings have carved wormlike topological spaces into the deformed, ballooning salt deposits of the region.

[Image: Avery Island, Louisiana, archived by the U.S. Library of Congress].

Obviously, the Gulf of Mexico is not the only salt-rich region of the United States; there is a huge salt mine beneath the city of Detroit, for example, and the nation’s first nuclear waste repository, the Waste Isolation Pilot Plant, or WIPP—which my wife and I had the surreal pleasure of visiting in person back in 2012—is dug into a huge underground salt deposit near the New Mexico/Texas border.

[Image: Inside WIPP; photo by Nicola Twilley].

Nonetheless, the Louisiana/Gulf of Mexico salt dome region has lent itself to some particularly provocative landscape myths.

You might recall, for example, the story of Lake Peigneur, an inland body of water that was almost entirely drained from below when a Texaco drilling rig accidentally punctured a salt dome beneath the lake.

This led to the sight of a rapid, Edgar Allan Poe-like maelström of swirling water disappearing into the abyss, pulling no fewer than eleven barges into the terrestrial deep.

[Image: Avery Island, Louisiana, archived by the U.S. Library of Congress].

But there is also the story of Bayou Corne, one of my favorite conspiracy theories of all time.

[Images: Avery Island, Louisiana, archived by the U.S. Library of Congress].

As the New York Times reported back in 2013, “in the predawn blackness of Aug. 3, 2012, the earth opened up—a voracious maw 325 feet across and hundreds of feet deep, swallowing 100-foot trees, guzzling water from adjacent swamps and belching methane from a thousand feet or more beneath the surface.”

One resident of the area is quoted as saying, “I think I caught a glimpse of hell in it.”

More than a year after it appeared, the Bayou Corne sinkhole is about 25 acres and still growing, almost as big as 20 football fields, lazily biting off chunks of forest and creeping hungrily toward an earthen berm built to contain its oily waters. It has its own Facebook page and its own groupies, conspiracy theorists who insist the pit is somehow linked to the Gulf of Mexico 50 miles south and the earthquake-prone New Madrid fault 450 miles north. It has confounded geologists who have struggled to explain this scar in the earth.

To oversimplify things, the overall theory—that is, the conspiratorial part of all this—is that the entire landscape of the Gulf region is on the verge of subterranean dissolution. The very salt deposits so beautifully mapped by the Bureau of Ocean Energy Management are all lined up for eventual flooding.

As this vast underground landscape of salt dissolves, everything from east Texas to west Florida will be sucked down into the abyss.

[Image: Avery Island, Louisiana, archived by the U.S. Library of Congress].

It’s unlikely that this will happen, I should say. You can sleep well at night.

In the meantime, the sorts of salt-mining operations depicted here in these photographs have carved their worming, subterranean way into the warped terrains of salt that dynamically ooze their way up to the surface from geological prehistory.

[Image: Avery Island, Louisiana, archived by the U.S. Library of Congress].

Be sure to check out the full gigapixel BOEM map, and the helpful write-up over at Eos is worth a read, as well. As for the Bayou Corne conspiracy—I suppose we’ll just have to wait.

(Bathymetric maps spotted via Chris Rowan; salt mine photos originally spotted a very long time ago via Attila Nagy).

Tokyo Secret City

This is an old story, but I still like telling it. Japanese researcher Shun Akiba has apparently discovered “hundreds of kilometers of Tokyo tunnels whose purpose is unknown and whose very existence is denied.”

[Image: From the LOMO Tokyo flickr pool; image by someone called wooooooo].

Shun, who believes he is now the victim of a conspiracy, stumbled upon “an old map in a secondhand bookstore. Comparing it to a contemporary map, he found significant variations. ‘Close to the Diet in Nagata-cho, current maps show two subways crossing. In the old map, they are parallel.'”
This unexpected parallelization of Tokyo’s subway tunnels – a geometrician’s secret fantasy – inspired Shun to seek out old municipal construction records. When no one wanted to help, however, treating him as if he were drunk or crazy – their “lips zipped tight” – he woke up to find his thighs sealed together with a transparent, jelly-like substance –
Er
Actually, he was so invigorated by this mysterious lack of interest that “he set out to prove that the two subway tunnels could not cross: ‘Engineering cannot lie.'”
But engineers can.
To make a long story short, there are “seven riddles” about this underground world, a secret Subtokyo of tunnels; the parallel subways were only mystery number one: “The second reveals a secret underground complex between Kokkai-gijidomae and the prime minister’s residence. A prewar map (riddle No. 3) shows the Diet in a huge empty space surrounded by paddy fields: ‘What was the military covering up?’ New maps (No. 4) are full of inconsistencies: ‘People are still trying to hide things.’ The postwar General Headquarters (No. 5) was a most mysterious place. Eidan’s records of the construction of the Hibiya Line (No. 6) are hazy to say the least. As for the ‘new’ O-Edo Line (No. 7), ‘that existed already.’ Which begs the question, where did all the money go allocated for the tunneling?”
Shun even “claims to have uncovered a secret code that links a complex network of tunnels unknown to the general public. ‘Every city with a historic subterranean transport system has secrets,’ he says. ‘In London, for example, some lines are near the surface and others very deep, for no obvious reason.'” (Though everyone knows the Tube is a weaving diagram for extraterrestrials).


Further, Shun reveals, “on the Ginza subway from Suehirocho to Kanda,” there are “many mysterious tunnels leading off from the main track. ‘No such routes are shown on maps.’ Traveling from Kasumigaseki to Kokkai-gijidomae, there is a line off to the left that is not shown on any map. Nor is it indicated in subway construction records.”
Old underground car parks, unofficial basements, locked doors near public toilets – and all “within missile range of North Korea.”
What’s going on beneath Tokyo?

(Thanks to Bryan Finoki for originally pointing this out to me! For similar such explorations of underground London, see London Topological; and for more on underground Tokyo, see Pillars of Tokyo – then read about the freaky goings-on of Aum Shinrikyo, the subway-gassing Japanese supercult. And if you’ve got information on other stuff like this – send it in…)

The Great Man-Made River

Libya’s Great Man-Made River is “an enormous, long-term undertaking to supply the country’s needs by drawing water from aquifers beneath the Sahara and conveying it along a network of huge underground pipes.”

[Images: The concrete skeleton of Libya’s future river, the “8th wonder of the world,” being trucked into place; photographed by Jaap Berk].

Not only does Libya bear the distinction of holding the world record for hottest recorded temperature (136º F), but most of the country’s terrain is “agriculturally useless desert” that receives little or no rainfall. The Great Man-Made River may not even successfully irrigate Libya’s governmentally-specified agricultural zones, but due to the region’s complete “absence of permanent rivers or streams” – and because the country’s “approximately twenty perennial lakes are brackish or salty” – the River’s expected 50-100 year lifespan is at least a start.

Indeed, Libya’s “limited water is considered of sufficient importance to warrant the existence of the Secretariat of Dams and Water Resources, and damaging a source of water can be penalized by a heavy fine or imprisonment.” George Orwell would perhaps call this watercrime.

However, I have to say that the prospect of spelunking through the Great Man-Made River’s subterranean galleries in 125 years, once those tunnels have dried-up, makes the brain reel. Imagine Shelleys of the 22nd century wandering through those ruins, notebooks in hand, taking photographs, footsteps echoing rhythmically beneath the dunes as they walk for a thousand kilometers toward the sea…

Yet some are skeptical of the project’s real purpose. Precisely because the Great Man-Made River consists of “a stupendous network of underground tunnels and caverns built with the help of Western firms to run the length and width of the country,” some consultants and engineers “have revealed their suspicion that such facilities were not meant to move water, but rather to conceal the movement and location of military-related activities.” The fact that water is flowing through some of the pipes, in other words, is just an elaborate ruse…

In any case, the Great Man-Made River Authority – “entrusted with the implementation and operation of the world’s largest pre-stressed concrete pipe project” – is already seeing some results.

The network will criss-cross most of the country –

– and Phase III is under construction even as this post goes online.

Meanwhile, for more information on deep desert hydrology see UNESCO’s International Hydrological Programme or even Wikipedia.

Of course, you could also turn to J.G. Ballard, whose twenty year-old novel The Day of Creation is: 1) not very good, and 2) about a man who is “seized by the vision of a third Nile whose warm tributaries covered the entire Sahara.” That river will thus “make the Sahara bloom.” The book was modestly reviewed by Samuel Delany, if you want to know more.

On the other hand, I would actually recommend Dune – assuming you like science fiction.

[Image: A new river is born, excavated from the surface of the desert: soon the pipes will be installed and the currents will start to flow…].