Using a submarine yacht could open a lifestyle similar to a business jet owner - you could travel worldwide, take your office and comfort with you. In fact the interior design of a submarine yacht would be in most aspects very similar to a big business jet as both vessels are basicly tubular pressure resistant structures.
interior design in a tubular structure
Elegant interior design in a tubular vessel.
The most important difference is in the cost of the vessel a submarine yacht is much more economic to build and maintain.
While business jets are limited to light panels, a submarine yacht interior design can also include heavy items like a jaccuzzi.