Begonia Paradise

At first, it was just a huge tsunami, an earthquake changed by gravity, and a volcanic eruption. Everyone classified it as a natural disaster, and only a few people thought about building a "paradise" there. Due to an asteroid impact, the moon's outer shell was destroyed. Inside the previously scientifically defined hollow, volcanoes erupted and a large amount of gas gushed out, causing it to rotate and change its gravity. All the high tech is there, cars all over the sky, top medical treatments, extended lifespans due to changes in gravity. The original construction workers also became residents there.