Deep Underwater Cities
Build cities deep underwater for reducing likelihood of extinction from natural catastrophic events.
Unavoidable natural catastrophies, such as Gamma Ray Bursts could affect life not just on Earth, but potentially on other planets of The Solar System almost simultaneously.
Even right now, as we don't have a colony in Mars, it would make sense building a self-sustaining city deep under the sea. People could live from cultivating sea cultures.
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中国では進歩が見られます：南シナ海に3kmの水中に海の実験室を建設する。ブルームバーグは次のように書いています。「このプロジェクトは、3月に発表された中国の現在の5か年経済計画で言及され、科学技術の優先事項トップ100のリストで2位にランクされました。」
Looks like we've got progress in China: building a sea lab 3km underwater in the South China Sea. Bloomberg writes: "The project was mentioned in China's current five-year economic plan released in March and ranked number two on a list of the top 100 science and technology priorities."