The disk-homes are 40 feet in diameter. Like the flying saucers that lend the UFO its name, the disks bulge in the middle, to accommodate an above-sea and below-sea room. Each room is designed to be 7 feet 2 inches at the deepest, so this isn’t a great fit for any basketball players (they can probably afford to stay on land, anyway). Below deck there’s a bathroom and a bedroom, accessed by a ladder from the above-water top deck, which is a combined kitchen, living, and dining room. It’s all the compact thrill of a tiny house, only with the added danger of Poseidon’s wrath.