Calamity Myths

I haven't done a mythology post in a while. Last night I read some Zoroastrian myths; they were OK, but nowhere near as bonkers as the Egyptian and Mesopotamian myths I shared a few months back.
It seems that most mythologies have a calamity myth, in which the human population goes through a bottleneck due to some natural disaster.

In Akkadian mythology (from ancient Mesopotamia), the earth gets too crowded and the humans get too noisy, so the charismatic god Ellil convinces the Divine Council to wipe out humanity using a flood. The kind god Ea warns his human friend Atrahasis, advising him to build a giant boat so that some life might survive. When the flood comes, the gods look upon their work, the drowned corpses of humans and animals, and feel ashamed that they committed genocide just because the charismatic Ellil suggested it.

In Hebrew mythology, Yahweh regrets making humans so decides to wipe out all life except for Noah's family and the animals on his ark. Yahweh reboots creation, with Noah as a second Adam.
In a Phrygian flood myth, Zeus and Hermes advise a kindly old couple to climb a mountain to avoid the flood which is going to wipe out Phrygia's resident dickheads.

In Egyptian mythology, Re, the Most High God, gets sick of humans complaining about the world being shit and doubting his existence (gods are notoriously insecure about whether they exist), so he sends a giant lioness to kill the unbelievers. The lioness becomes enraged and starts slaughtering everyone. After the lioness is subdued (they trick it into drinking beer so it gets drunk and falls asleep), Re quits and leaves the lesser gods in charge of earth, embarrassed by his colossal fuck-up.

Etc. So many myths.

The Zoroastrian calamity myth is noteworthy for its aggressive advocacy of selective breeding and eugenics. Zoroastrians believe the universe is the battleground between a Good God (Ahura Mazda) and a Bad God (Angra Mainyu). Shortly before the end of time, the Saoshyant, the World Saviour, will be born and lead the forces of good in an all-out battle with the forces of evil. The Bad God will be defeated and the universe made perfect. (During their Babylonian exile, Jews hung around with Zoroastrians and thought that some of their ideas were pretty cool.)

One day, the Good God warned King Yima that the Forces of Evil were about to go on the offensive: winter is coming, a winter lasting years. He commanded Yima to build an underground city, and populate it only with the best stock, human and animal.

"In order to save yourselves, you must make a large, square-shaped underground enclosure and fill it with the seeds of sheep, oxen, men, dogs and with red blazing fires. You must make one square enclosure for people and another for oxen and sheep. You must make waters flow there, and you must provide everything and everyone with food that never runs out. You will have to build homes there - houses with balconies, courtyards, and galleries. Only the greatest, best, and finest men and women must fill the enclosure. Only the greatest, best, and finest cattle on earth must be brought in.
No one humpbacked or in any way deformed must be allowed into the enclosure. No one self-important or insane, no one who lies or is spiteful or jealous must be allowed in. No one in there should have decayed teeth or be afflicted with leprosy or any of the other illnesses with which Angra Mainyu harms peoples bodies."

Yima did as he was told.

(There's more, but I assumed you didn't want to learn about the layout of the city's streets, etc.)