Taking a page from Jules Verne’s Twenty Thousand Leagues Under the Sea, the Austrian-based Migaloo Submarines will design, engineer, and build a private submersible yacht for anyone with deep-enough pockets. The yachts take the concept of privacy to a whole other level, as they can remain submerged both at anchor and when cruising between destinations. An offshoot of the design firm Motion Code: Blue (whose 918-foot supertanker luxury yacht concept Imāra features a four-level ski resort with chair lift and ski lodge), Migaloo will work with clients to customize its designs to accommodate any size specifications or alternate configurations based on four primary models currently offered.

The 236-foot M2 was also designed with the potential to be an underwater restaurant and bar or a conference center, depending on the client’s needs. The 442-foot M5 and 524-foot M6 come with three viewing galleries, a starboard saloon, a portside dining area, a wine room, a library, and a lounge with bar at the bow. The owner’s apartment spans three levels including a private bow terrace; additional accommodations include six VIP suites. The M5 and M6 also feature an outdoor pool and hot tub (accessible when surfaced), a helipad, and a wet garage that accommodates two 36-foot minisubs for smaller-scale exploration.

Boasted by Migaloo as the world’s largest submersible superyacht, the 738-foot M7’s design is based on the United States Navy’s Zumwalt-class destroyer. It is capable of 40 knots on the surface and 20 knots underwater (for when seas get rough) and, as with the other models, submerging will keep passengers in a depth of luxury that would make even the Nautilus seem substandard. (migaloo-submarines.com)