So I was cruising around the web when I found this interesting article about the Luxury Submarine called The Neyk.
Start-up company working in Netherlands is offering 19 meters long and 100 tons weighing submarine which can hold a total of 12 passenger. With leather seating, separate bar area, galley and an library the cab reminds me of a luxury private jet. The company was planning this for 8 years and the project involved many famous engineering companies like Rolls-Royce, Bosch etc. Streamlined, module built underwater-base is made from steel alloy from HY-80 Space Agency NASA created project. The Neyk has 100kw power engine and they should let it dive as far as 150 meters deep. With a speed of 28km(15knots) per hour.
It includes all latest luxuries, and comfort elements, including High-Definition flat screen TV's hidden inside walls, WC with marble decorated cabinets, crystal created drinking cups, balcony and even an air gap for divers.
Here's a link to an Youtube video of the Submarine
The first Neyk should be ready by 2018. January, but this is still doubtable because it's still one big project.