Mike Sowden Profile picture
Jun 28 15 tweets 6 min read
When my Zanclean Megaflood thread went nuts in February, some folk said "look into a thing called Atlantropa! It's just as mindblowing!"

They weren't wrong. And now I can't get *this* story out my head either.

So, once more, here we go.

1/
It's 1928.

This is German architect Herman Sörgel. Horrified by the First World War, keen to see everyone put down their weapons & actually, properly work together for a change, he's just had a idea that would solve *everything*.

He's going to drain the Mediterranean.

2/
No, really. It's simple!

All it would take is a series of dams:

- Across the Gibraltar Strait
- Across the Dardanelles to hold back the Black Sea
- Between Sicily and Tunisia, road-linking Europe & Africa
- At the Suez Canal.

Easy-peasy.

3/
By cutting off the Atlantic that replenishes it, Sörgel would engineer a new Messinian Salinity Crisis, the ancient event that dessicated the Mediterranean.

After a mere century or two, the western Med would have evaporate itself about 100m deeper than the Atlantic side...

4/
...and a hydroelectric dam across the 9 miles / 14 km wide Atlantic Strait would generate enough electricity for *everyone*.

Of course, it'd be the biggest dam in history, requiring more concrete than existed on Earth. And only be the first of five!

But Sörgel had a DREAM.

5/
If everyone ploughed their money into *this*, surely they wouldn't have enough left over to build armies, navies, air forces?

And their reward for cooperation was a bottomless renewable energy money-pit.

Awesome! Except...

6/
...the fifth dam would be on the Congo, flooding the vast basin of land around Lake Chad - pop. today: 20-30 million.

And "Atlantropa" --> Atlantic + Europe. It was by Europeans, FOR Europeans (the wealthier ones).

A final, terrible part of the 'Scramble for Africa'.

7/
But beyond the colossal amount of Yikes there - was Sörgel onto something here?

After all, check out this map of the land gained from a 100-metre drop of the Med. 660,000 km²! (By comparison, Spain is 500,000 km².)

Is this a vision of the future we could all embrace?

8/
LOL. No, mate. It's pretty much loopy from start to finish.

eg. Hey, where would all that evaporating water go? (Answer: into other seas, with dire consequences elsewhere.)

What about wildlife?

And everyone working smoothly together for a common goal? How, um...ambitious.

9/
Nevertheless, maybe (smaller, saner) megaprojects can stir lots of people into action.

If we're best motivated when we "long for the immensity of the sea" as @calflyn quotes here...

prospectmagazine.co.uk/magazine/clima…

...maybe we'd *also* get excited about the shape of our boat?

10/
This is a story from my newsletter, which is about things that make you go WOW:

everythingisamazing.substack.com

I just wrapped this season, which was all about oceans, megafloods and (in this case) architects with *literally* no sense of proportion...

11/
...and this is what the next season is about.

everythingisamazing.substack.com/p/colourful-qu…

OK, enough shameless self-promoting. If you want to know more about Atlantropa...

12/
...@EverywhereTrip has a great overview on his podcast:

everything-everywhere.com/atlantropa-the…

(I can't argue with the title either.)

13/
And here's the mighty @atlasobscura on it:

atlasobscura.com/articles/the-b…

(Again with the Yep-That's-The-Right-Title thing.)

14/
And finally, if you didn't yet know about the Zanclean Megaflood? Oh boy, this one will blow your mind - because it actually happened*:



Whew. Ok. I'm done.

Thank you for reading!

*Proposed, but backed up with highly compelling evidence.

• • •

Missing some Tweet in this thread? You can try to force a refresh
 

Keep Current with Mike Sowden

Mike Sowden Profile picture

Stay in touch and get notified when new unrolls are available from this author!

Read all threads

This Thread may be Removed Anytime!

PDF

Twitter may remove this content at anytime! Save it as PDF for later use!

Try unrolling a thread yourself!

how to unroll video
  1. Follow @ThreadReaderApp to mention us!

  2. From a Twitter thread mention us with a keyword "unroll"
@threadreaderapp unroll

Practice here first or read more on our help page!

More from @Mikeachim

Jun 3
There's a vast patch of seagrass off the coast of Australia (3 x the size of Manhattan) - and now genetic testing has discovered it's a *single plant* around 4,500 years old:

bbc.co.uk/news/world-aus…

But incredibly, this isn't our planet's biggest living organism...

1/
Oooh. Actually, I might be dead wrong on this. Last I heard, there are single examples of honey fungus in Oregon & Russia that hold that title:

scientificamerican.com/article/strang…

(The Oregon fungus could be up to 8,650 years old, which makes us look a bit like mayflies in comparison.)
But the Australian seagrass covers nearly *200 sq km*, which far outstrips the extent of any recorded single fungus, I think?

Certainly, many places are reporting the seagrass story as The World's Biggest Organism:

science.org/content/articl…

So - okay then.
Read 4 tweets
Apr 24
If today's a slow one, how about a stroll along the world's longest mountain chain?

No, not Himalaya (2,500km). And not the Andes (7,000km) either.

This one's....65,000km long.

But it's ok. We'll just do a bit of it.

1/
We start in Iceland. (Credit: flickr.com/photos/sackerm…)

OK, I lied. It's only really here can you walk along it: the Þingvellir National Park, where, geologically speaking, North America & Europe are slowly drifting apart.

Enjoy the sunshine! There's none where we're going.

2/
If we went southeast into the water, it gets deep really quickly - maybe 2,000 metres, same as the Black Sea. About the depth of a Russian battleship.

*cough*

But we're following the Mid-Atlantic Ridge - so southwest it is.

3/
Read 29 tweets
Apr 24
Off of the news that Twitter is banning advertisements that contradict the scientific consensus on climate change (washingtonpost.com/technology/202…) and the inevitable kerfuffle, a distinction worth noting:

Denialism is not the same as healthy, questioning criticism. Not at all.

1/
This gets incredibly complicated and tangled, but - whenever something is contradicting the consensus with *absolute certainty*, it's probably bullshit. Utter certainty is the smoking gun there.

No curiosity, no interested questions, no willingness to be proven wrong.

2/
I guess it's the effect of "one man against the world" narratives, but - the thing about the consensus is it's where basically the weight of all the evidence is.

To overturn one, you need to try to overturn the other. If you're not, while claiming utter certainty?

Yikes.

3/
Read 5 tweets
Mar 25
I thought I knew the story of the "lost world" off the east coast of Britain, inhabited by Mesolithic people until rising sea waters engulfed it around 8,000 years ago...

But I didn't know about the *tsunami*.

Holy hell.

1/

(Image: bigissue.com/opinion/discov…)
What follows is my imperfect grasp of things. Imperfect because I'm just an enthusiast who likes science - and also imperfect because, excitingly, *the work is happening right now*, in one of the greatest prehistoric archaeological investigations in history.

2/
One September night in 1931, the British vessel Colinda hauled up its nets 25 miles off the Norfolk coast - and found something beautiful & deadly.

Embedded in a lump of peat was this 8.5 inch prehistoric harpoon, carved from bone or antler...

3/
Read 20 tweets
Feb 8
I recently learned something mindblowing about the geological history of the Mediterranean Sea, and I just can't get it out of my head.

Now I'm going to make it *your* problem too. Sorry.

Hang onto your hat. This is wild.

1/ Image
This is the Strait of Gibraltar, where Europe and Africa reach out to *almost* touch each other.

At this point there's only 13 km/ 8 miles between them - and it's where the Med feeds into the Atlantic.

Imagine if something absurdly Roland-Emmerichy happened & it closed up?

2/ Image
No need to imagine - because it actually did.

It's called the Messinian Salinity Crisis, and it happened around 5-6 million years ago:

en.wikipedia.org/wiki/Messinian…

After a presumably colossal tectonic shift, the Pillars of Hercules closed (or more correctly were bridged)....

3/
Read 27 tweets
Jan 19
The first time I saw the Northern Lights in real-time, like many folk, I was shocked. "But - I thought they moved slowly, like clouds?"

As you can see: not so much:



So I got curious. What else don't I know about these amazing things?

1/
Firstly: they're not just green.

Different heights of our atmosphere = different gases, & when charged particles from the sun excite gases at different altitudes, you get different colours.

*Wildly* different. Blue, pink, purple, yellow and (rarely) red.

I had no idea.

2/
Secondly: here's a weird thing discovered during an aurora above British Columbia:

"The temperature 300km above Earth’s surface jumped by 3000°C and the data revealed a 25 km-wide ribbon of gas flowing westwards..."

3/
Read 7 tweets

Did Thread Reader help you today?

Support us! We are indie developers!


This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member ($3/month or $30/year) and get exclusive features!

Become Premium

Don't want to be a Premium member but still want to support us?

Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal

Or Donate anonymously using crypto!

Ethereum

0xfe58350B80634f60Fa6Dc149a72b4DFbc17D341E copy

Bitcoin

3ATGMxNzCUFzxpMCHL5sWSt4DVtS8UqXpi copy

Thank you for your support!

Follow Us on Twitter!

:(