The idea of a superyacht that pampers guests with luxury both atop and below the waterline is one that has long been a fantasy for demanding billionaires. But with the Nautilus, U-Boat Worx is determined to bring the concept to reality.

Capable of functioning as both an on-water vessel and a submersible, Nautilus has a depth rating of over 200m. The diesel-electric craft has a surface cruise speed of nine knots and an underwater speed of four knots and can stay underwater for up to four days at a time, according to the company.

Nautilus

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When functioning as a yacht, Nautilus has a range of relaxation and recreational features including a sizeable sundeck equipped with a freshwater pool, a bar and a dining table where guests can enjoy meals from the fully equipped galley....