Have a surface level. The take a sub go underneath to another level. You go underneath the house. you're in a house still you go out side and you see a dome covering the house. And you look up and see the sunlight and a whole lotta fishes. That's my idea with the house having two or three levels as the surface will be about as big as the Clift on Tatooine . Same price as tattooine. Don't forget a stairway to the roof of the house or a better view of the ocean and sunlight.