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An entire sea vanished — then came back in under two years, in the largest flood the planet has ever seen. This is the Messinian Salinity Crisis and the Zanclean megaflood, told from the salt on the seafloor up.

Around 5.97 million years ago the Mediterranean was cut off from the Atlantic. Under a brutal sun it evaporated faster than its rivers could refill it, dropping as much as two kilometres and losing up to 80% of its water. For a while you could have walked from Africa to Europe across a salt desert three kilometres below sea level. Then, around 5.33 million years ago, the Atlantic broke through at Gibraltar — a kilometre-tall waterfall pouring roughly 100 million cubic metres of water every second, about a thousand Amazons, refilling 90% of the basin in a matter of months.

Nothing that emptied it has stopped. Africa is still pushing north. The gate at Gibraltar will be closing again.

Chapters:

0:00 The Mediterranean Sea dries up

1:03 The salt that proved it happened

3:34 How plate tectonics closed Gibraltar

5:47 How far the sea level dropped

7:17 The land bridge to Africa

8:57 The case against the desert

9:34 The Atlantic breaks through Gibraltar

11:31 The megaflood evidence off Sicily

13:41 Atlantropa: damming the Mediterranean

16:09 Seas drying up today

Flooding animations by:

https://www.youtube.com/@UCNG9eoqcsJFesU9fnMlURPw

https://www.youtube.com/@UC4szl4Ra1ZD3m80wJP40UBA

Sources:

Garcia-Castellanos et al. — the 2009 flood model

https://www.nature.com/articles/nature08555

Aloisi et al. — the 2024 salt-chemistry reconstruction of the drawdown

https://www.nature.com/articles/s41467-024-53781-6

Micallef et al. — the seafloor survey of erosional ridges, southeastern Sicily

https://www.nature.com/articles/s43247-024-01972-w

García-Castellanos et al. — the 2025 river-erosion and Lago Mare study

https://www.science.org/doi/10.1126/sciadv.ads9752

Amarathunga et al. — the 26,000-year recovery of the eastern basin

https://www.nature.com/articles/s41561-022-00998-z

Andreetto et al. — the Nile canyon study (the 600 m counter-argument)

https://www.nature.com/articles/s43247-022-00540-4

Kenneth Hsü — "The Mediterranean Was a Desert: A Voyage of the Glomar Challenger"

https://archive.org/details/mediterraneanwas00kenn

Visuals in this film are labelled on screen as conceptual, artist's impression, or visualisation.

#Mediterranean #Geology